Feeding niche and bill evolution specific to prey was shown by Charles Darwin to be an extemely important factor in speciation in birds and this is seldom so obvious than in shorebirds. The wide range of bill sizes and shapes in shorebirds is an obvious indicator to the different feeding techniques they employ and the different types of prey they search for. Most of us think of wading birds as having straight bills, upturned bills or downturned bills and this is obviously true, but what is less well know is the ability they have to change the shape of their bill through a process called rhynchokinesis. This is usually impossible to see with the naked eye as it happens so quickly but I have found that it can sometimes be seen in photographs once I have returned home to study the images.
Over the course of a few visits I have been able to get very close to roosting Dunlin and was lucky enough to have excellent light that allowed me to take a series of high-quality photographs, some of which revealed this phenomenon. Read more »

May 14th, 2021
Nick




