Crows To Clean Up Cities – Ignorance Versus Intelligence

Carrion crow Merilyn

The list of animal exploitation is long and includes the abuse of animals for food, clothing, entertainment and experimentation as well as as companions and workers. Right now, there is a new scientific project making its rounds through the media, which is suggesting a new method to keep our cities clean. The idea has been developed by Dutch scientists und is focussing on the utilisation of specific traits of an animals species, which could theoretically help to tackle one of the biggest human evolutionary shortcomings – to be willing to live in harmony with nature and the environment. The project design incorporates a machine and is recruiting and training city crows, who would take care of recklessly discarded cigarette butts.

It is known that cigarettes take between ten and twelve years to decompose. The scale of this waste problem is huge, as it is estimated that every year approximately 4.5 trillion cigarettes are discarded with no regard for the environment. The project is using a so called ‘Crowbar’, which is based on a design created by an American inventor. The device has a large funnel, where cigarette butts can be deposited, and a dispenser for releasing peanuts as a reward. The hope is that crows get busy cleaning up the streets in exchange for some easy food. This idea is trying to utilise the generally acknowledged fact that crows are very intelligent and adaptable being known for their ability to solve complex problems and also to create and use tools.

Before looking at ethical questions related to this idea, there are at least two ‘technical’ problems to address, which the inventors might not have fully thought through. First off all, it is very likely that crows will always have a food choice in our crowded cities, meaning that peanuts may not be that much attractive as a food reward. Secondly, our crows are usually territorial, which means that only one territory holding pair is going to use that machine, which doesn’t seem very efficient, when it comes to cleaning up our large cities. These two problems alone are likely to be sufficient enough, to put this questionable idea to rest.

However, without a doubt, this project raises also several ethical issues, the most important ones being the egocentric and anthropocentric way of human thinking and attitude. Obviously, common sense tells us that the far simpler and cheaper way of solving the cigarette butt problem is to educate people, in this particular case smokers. Instead of constructing, deploying and maintaining machines, which are leaving a noticeable carbon foot print behind, one should rather educate and encourage smokers to quit smoking, or at least to discard their waste products appropriately, which is the least one could expect from a grown up human being.

Carrion crow Pan Tau

However, the problem is far more complex than that. Firstly, as mentioned already, the suggested solution is based on an anthropocentric view point. Humans have long tested animals to see how smart they are by seeing if they can do human-like tasks. We are too quick to judge animals by our own human standards, instead of testing within the limits of the animals’ natural behaviour and within their natural setting. By any standard used, we all know that corvids are clever enough to be able to fulfill this particular task, but so are other sentient beings, like toddlers too. And this leads to the second problem.

Humans do not treat sentient and intelligent beings like crows as equals, meaning we treat them differently, and by far not the way we would want to be treated, despite that there is a general agreement about the fact that humans and crows are both, sentient and intelligent. It is actually even worse, the anthropocentric view point is so deeply rooted, that many humans are often tend to focus on the level of animal intelligence (compared to humans) rather than sentience, when it comes to decide how to treat an animal, ignoring completely the fact that humans are not unique in possessing the neurological substrates that generate consciousness.

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The truth is that this machine, when it would actually work, would exploit crows, ignoring the fact that it is morally wrong to use or exploit sentient beings in any way. Even worse, this machine is putting these birds at an additional risk by encouraging and rewarding them to handle toxic and also possibly still burning cigarette butts, which might even end up in a place, where we might not want them to be. Furthermore, at least to a certain degree, these birds will be made dependent to rely on human handouts. Based on the natural behaviour of corvids, they will also cache their food, or potential valuables like cigarette butts, as they might want to trade them in later. The result will be that litter will not only be removed, but also be distributed in a different, not nessarily desired pattern. It is also to expect that crows will test the built in scanner to its limits, simply to find out, if other items like pebbles or pieces of paper also trigger food rewards, something which will put the whole machine to a test.

Carrion crow Arwen

Sadly, even some bird and corvid lovers seem to find this idea fascinating, as they feel that this approach spreads the word and is helping to change and improve the traditionally bad reputation of corvids. It might even do that, but by disregarding the rights of an individual sentient being and by supporting exploitation. Luckily, regardless of all ethical issues, and purely due to technical problems alone, it remains doubtful that this machine is ever going to work.

Rook Irenaeus – An Obituary

Rook Irenaeus

It is with great sadness that we have to announce the loss of our rook Irenaeus. He came to us in June 2017 following a phone call of a kind and concerned person, who spotted Irenaeus during a heavy downpour, when he was trying to find shelter next to a pub. We went to assess the situation and eventually decided to catch Irenaeus, who we found grounded, soaking wet and cold.

Rook Irenaeus

Apart from being slightly underweight and an increased internal parasite load, Irenaeus did not show any other obvious sign of disease or injury. He has been treated accordingly and settled in very quickly into our residential rook community. Over the following weeks it became clear that Irenaeus wouldn’t fly again, at least not for longer distances, despite the lack of any physical or medical reason. 

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Nevertheless, Irenaeus became quickly a well regarded community member amongst our rooks. Interestingly, we also noticed that in particular young birds enjoyed Irenaeus’ proximity, possibly being attracted by his very calm and relaxed attitude towards other, but in particular young birds. Over the last days of his life Irenaeus became a little quieter than usual, but still enjoyed his food and company very much.

Rook Irenaeus

Sadly, last night Ireneaus passed away peacefully in his sleep. We don’t know how old Ireaneus was, but we think that he must have been quite old already. We are relieved that he was able to spend the last months of his life in peace and comfort enjoying in particular the close friendship to our residential rook Anthea. Irenaeus, you will be greatly missed. Rest in peace! 

Spinal Trauma Rehabilitation – Magpie Anton’s Story

Admission – 28/06/2016

Anton, an immature magpie, came to us as in June 2016. He has been found hiding in a greenhouse after being injured and unable to fly. At admission we found a subacute fracture of radius and ulna of his left wing. The fracture has been treated conservatively and splinted accordingly. Anton made a full and uneventful recovery, and four weeks later he has been successfully soft released. Anton stayed in the area and has been seen daily returning for some snacks.

Update – 20/08/2016

The last three weeks, after we opened the release aviary, magpie Anton stayed in the closer vicinity and came back almost every day for food and to visit some old friends, in particular magpie Ebony. However, today we have been shocked to find Anton near his release aviary lying on his back and being unable to walk or stand. Although we don’t know what has exactly happened, the admission assessment revealed very quickly that our unlucky magpie fellow Anton suffered a severe impact trauma, which has resulted in a spinal contusion with subsequent partial paralysis of both wing and legs. 

Rehabilitation Of Brain And Spinal Trauma Patients

The treatment of corvids in general, but in particular the treatment of spinal injuries in birds can be a controversial topic and is handled inconsistently. Apart from the disappointing species related fact that corvids are often not treated and rehabilitated at all, a spinal trauma or spinal injury with partial or complete paralysis of wings, legs or both, is commonly seen as an acceptable reason for an immediate euthanasia. And even if a rehabilitation attempt is undertaken, often enough these birds are hastily euthanised after only a couple of days without significant improvement. Our own experiences, rehabilitation approach and results are different, focussing on birds without a fracture or on birds with non-displaced spinal fractures only. It has to be noted that displaced spinal fractures usually result in irreversible damage to the spinal cord and a recovery is very unlikely. In these cases euthanasia is probably the kindest option.  However, these kind of decisions have to be made on a case by case basis. In all other cases outlined above, a treatment attempt should be considered. If there is no noticeable improvement within a fortnight, chances of recovery are remote. However, as soon as there is a noticeable improvement observed, chances of a full recovery will increase markedly over time. Under these circumstance the rehabilitation process and timeline will be extended and adapted accordingly. The video clip below shows some of the milestones of Anton’s rehabilitation process and recovery including his second successful soft release. 

Considerations For The Early Rehabilitation Phase

Magpie Anton is a typical example, which proves that birds with spinal injuries should be given a second chance and that these birds can make a full recovery. At admission Anton was unable to stand or walk at all. He was able to fly short distances, but in a very uncoordinated way, which did suggest a mild coexisting concussion. As in any other rehabilitation situation, the rehabilitation process needs to be frequently adapted according to the degree of neurological deficit and should also take the personality of the individual concerned in account. The treatment usually starts off with a secure and padded hospital box in a quite and dimmed light setting, with the primary goal to keep the bird calm and the blood pressure low, without using any restraints (e.g. bird harness or sling). This is in particular important during the first week, as the risk of a sudden neurological deterioration is highest during the first 24 hours after the trauma. Any bleed or haematoma within spine or brain will lead to a compression of the surrounding structures, also resulting in an additional perifocal swelling or oedema, which usually peaks at 72 hours and persists for about 5 days. These findings might explain a second mortality peak commonly seen at the third day post accident and they also justify the necessity to give any bird with a brain or spine injury enough time and a chance to recover. Based on these facts and our own experiences, it becomes evident that the 14 day rule seems to be a good compromise. 

Longterm Rehabilitation Of Brain And Spinal Trauma Patients

For the next phase of the rehabilitation process, a padded play pen or baby cot works very well, which allows the bird to exercise in a safe environment, as the bird is usually not in full control of his or her movements and may be prone to injuries. Not unsurprisingly cleanliness is paramount, primarily to avoid additional damage to and contamination of the plumage, which is at risk to excessive wear and tear in particular in birds, which are unsteady and prone to falls. The added interior of the padded pen has to be chosen carefully, to take again all these facts in account. This also obviously includes water dishes to avoid accidental drowning in unsteady patients. When the bird has regained his or her abilities to control its movements, a transfer into a small safe aviary can be attempted to allow more freedom, entertainment and exercise. However, the progress has to be monitored closely, as frequent adaptations of the aviary setup may be necessary to adapt and optimise the rehabilitation process and to minimise any remaining risks of falls or injury. The final step of the birds recovery will be the transfer into a larger free flight soft release aviary. It goes without saying that these kind of bird patients are not suitable for a hard release at all. Soft release is the only viable option for any young or long-term patient allowing a gradual reintroduction back into the wild. 

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Update – 02/11/2016

Magpie Anton made a full recovery and has been successfully soft released for the second time. Anton teamed up with previous inmate Ebony, who has been also soft released together with Anton. Both birds stayed close by and are frequently visiting our garden, even a year after their final release. Stay safe Anton and Ebony!

Magpie Anton’s Story

Magpie Immanuel

Magpie Immanuel

Admission – 22/04/2017

Immanuel is an immature second year magpie, who has been observed being grounded in a garden for several days. Whilst being in hiding, Immanuel has been attacked by a cat, but luckily managed to escape. He has been eventually caught, when he was seeking shelter in a conservatory following the cat attack.

The admission assessment revealed no obvious injuries, but showed a loss of all tail feathers and severely damaged primaries and secondaries involving both wings rendering the bird being unable to fly. Immanuel has been treated prophylactically with antibiotics to prevent a potentially fatal infection caused by bugs transmitted by the cat. As the plumage has been found to be severely damaged,  Immanuel needs to undergo a complete or post breeding moult, which is usually happening over the summer and is going to be completed by the end of September. This also means, that Immanuel needs to stay with us for almost half a year before being releasable. 

Magpie Immanuel

Wild, and in particular adult wild magpies can be difficult patients, as they are often very nervous and easily excitable birds, who may have the tendency to harm themselves when being kept in captivity in a type of aviary, which doesn’t completely suit their needs. Sufficient shelter and hiding spaces are crucial to allow these birds to feel undisturbed and to relax in a captive environment.  Magpies enjoy to cache their food items and need therefore suitable areas,  where they can do so. It can be also sometimes difficult to introduce magpies into mixed species groups, as other corvid species are commonly reluctant to accept magpies amongst them. Although jackdaws are the most likely species to be tolerant enough to accept magpie company, it is more about the individual personalities than the species itself, as we had positive outcomes with jackdaws, crows, jays and rooks. Age and previous negative or positive experiences seem to play a role as well, as does the degree of maturity and the time of the year in respect of the breeding season. Generally speaking, mixed setups of this kind have to be closely monitored as they are prone to seemingly sudden change.

Update – 03/09/2017

Magpie Immanuel is doing well in his outdoor aviary, which he is sharing with magpie Kiri and jackdaws Benno and Kojak. He has moulted most of his primary and secondary feathers and has also regrown his tail feathers. The result looks promising and we are now hopeful that Immanuel can be released by the end of September, when his moult is completed. 

 

Magpie Immanuel

Update – 23/09/2017

Today magpie Immanuel has been successfully soft released. Stay safe Immanuel!

Finding The Optimal Diet For Corvids

Carrion crow Amor

Although corvids are generally known as scavengers and omnivores, the diet of the different corvids species does vary considerably, from species to species, and over the seasons of the year.  Only about 40% of the rooks’ diet for example consists of animal protein, and those being mainly worms, bugs and larvae. They usually don’t eat carrion, as their beak is not designed and able to rip animal carcasses into manageable pieces. The remaining 60% of the rooks’ diet are plant-based products like fruits, seeds and vegetables. During the winter time, carrion crows prefer seeds, berries and carrion, whilst during the summertime they do mainly live on animal protein like snails, worms, insects, small mammals and eggs. 

Carrion crow Amor

Hatchlings And Nestlings Up To 3 Weeks

When raising hatchling corvids it is important to feed a purely insect based diet for the first two weeks of their lives. Ideally these birds should be fed on an insect mash consisting of the following ingredients:

  • Frozen fresh insects like crickets and wax worms
  • Mineral and vitamin mixture like Korvimin ZVT+Reptile (WDT)
  • Boiled egg yolk
  • Soaked NutriBird Bird Complete pellets (Versele-Laga)
  • Minced beef
  • Small amounts of feathers and fur should be added to the mash occasionally, but only when the bird is older than 2 weeks, which will help to produce pellets

Alternatively one can also create a baby food mixture (Modified recipe,  original recipe by Samantha Bedford of Bedfordshire Wildlife Rescue) based on the following ingredients:

  • 2 parts ground up (80%) chicken biscuits (Applaws Kitten Food Chicken)
  • 1 part Hagen Tropicana Breeding Mash
  • 1 part Heath’s Prosecto Insectivorous Soft Food
  • Dried ants, flies and daphnia
  • Korvimin ZVT+Reptile by WDT (Nutrobal for Birds by Vetark)
  • Bene-Bac Powder for Birds and Reptiles by PetAg (AviPro Plus by Vetark)

Carrion crow Amor

Nestlings Older Than 3 Weeks

When the bird turns 3 weeks,  we would start reducing the amount of mash and introduce soaked cat biscuits in addition to the mash fed, which are of an ideal consistency and therefore easy to use for hand feeding. GoCat Chicken and Duck Complete pet food for adult cats (Purina) is well suited for corvids, as it provides the needed high protein contents required. It contains 20% rehydrated meat and animal derivatives, with a minimum 4% chicken and 4% duck (30.0% protein, 10.0% fat content). Tinned dog or cat foods are not a suitable diet for corvids and will most likely cause diarrhoea.

Carrion crow Amor

Fledglings

When the birds have fledged, a broader variety of food items will be added to the daily corvid menu, which will be provided in addition to hand feeding in a dish to encourage self feeding. Food will be supplemented with Korvimin ZVT+Reptile by WDT (Nutrobal for Birds by Vetark) to avoid a calcium deficiency. Alternatively one could also grind thoroughly cleaned empty snail shells, which make a good cheap, natural and easily digestible calcium supplement. The basic diet plan for all corvid species consists of:

  • Soaked cat biscuits (GoCat Chicken and Duck Complete pet food for adult cats (Purina)
  • Minced beef
  • Vegetables (fresh corn or maize, corn on the cob or peas)
  • Fruits (berries, grapes, apple or pear)
  • Scottish Rough Oatcakes
  • Good quality bird food seed mix enriched with peanuts, suet pellets and dried meal worms
  • Live meal worms (larval form of the mealworm beetle – tenebrio molitor) and wax worms (larval form of the wax moth – galleria mellonella)
  • Dead or frozen fresh insects like crickets, calci–worms (larval form of the black soldier fly hermetia illucens) or natural pinkies (larval forms of bottle flies)
  • Hazelnuts or walnuts for jays
  • Occasional food items in particular for crows include dead mice, day old chicks, raw pigeon eggs and cuttle fish bone

Worms and snails must not to be fed to corvids, although being part of their natural diet, as they are carriers of coccidia and worms. Although birds are being encouraged to feed themselves, assisted hand feeding needs to continue until the birds are completely weaned. Fledglings should also be moved into a suitable and spacious aviary, where they can learn to forage and are able to cache food.