If a bird is being found sitting on the pavement, fluffed up and lethargic, or is found lying on his or her back on the road or underneath a window, then it is very likely that the animal has suffered an impact trauma. Affected birds are often found unconscious or apathic. Window strikes or car collisions are the most common types of accidents leading to a concussion, spinal contusion or a combination of both.
Whilst doing a bit of research around this contentious topic, it became quickly apparent that there is no study or paper to find, which conclusively proves that feeding bread to waterfowl is the sole cause for the development of angel wing deformities. Despite this fact, most wildlife and waterfowl experts seem to agree that the overwhelming cause of angel wing is an unhealthily high protein and / or carbohydrate based diet. Unsurprisingly, it was not difficult to find plenty of advice and warnings suggesting not to feed bread to birds, and in particular not to waterfowl. However, with all the advice being provided, no scientific references were given, which would certainly help to clarify and understand the situation.
During the summer months birds require high protein foods, especially during their moult. During cold winter weather birds will benefit from high-energy or high-fat foods, which will help them to maintain their fat reserves and to survive frosty nights. Autumn is the time to change the composition of bird foods offered and perhaps the arrangement of your feeders. It is relatively easy to plan for winter bird feeding.
Canker is caused by a flagellate protozoan and is also known as trichomoniasis, roup or frounce. It is not transmittable to humans or other mammals, but can be caught by other birds that share the same water, eat seed dropped by an afflicted bird, or through direct beak-to-beak contact. The organism Trichomonas gallinae lives in the sinuses, mouth, throat, oesophagus and other organs. This disease occurs worldwide in warm climates or during warm weather.