However, if you wait until the eggs have hatched, it will often demonstrate a little more tolerance. The need to know this, and similar information, is critical to anyone wanting to photograph birds. Otherwise, we could very easily be the cause of a bird abandoning its nest. Regardless of the species, piping plover or great blue heron, the more information you have at hand, the more successful you will be in locating your subject, and making classic images. There are many sources for this type of information.
Scientific journals provide a wealth of information.
Search the pages of The Auk. The American Ornithologist's Union publishes a bimonthly series called The Birds of North America, each release featuring a different species. Inquire at your local public library, and university library concerning these publications, and others. Contact biologists working with state wildlife agencies, and those employed by the U.S. Fish and Wildlife Service. Many county governments employ biologists and do not overlook personnel at state and national parks, as well as national wildlife refuges.