by professionals, due to their exceptional height 10 m and abundance (hundreds in a single location).

Some nests, such as those built by bearded vultures, can last for several centuries, after being used by multiple generations of birds. In one of such nests, several human objects from the 13th to the 19th centuries were found, all of them in the same nest.

Nest builders

Nest architecture may be as useful for distinguishing species as the animals' physical appearance. Species identified

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