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Least tern chicks often fall from rooftop nests.

Credit: Sarah Goodwin-Nguyen
article: When Least Terns Nest on Rooftops 		Other images from this article
These chicks must be returned to the rooftop. A chick-a-boom helps return chicks to the roof. Least tern chicks often fall from rooftop nests.
Least tern chicks often fall from rooftop nests., Sarah Goodwin-Nguyen