Chemical analysis demonstrates communal nesting in dinosaurs

The reproductive behaviors of birds are some of their most conspicuous and endearing qualities. From the colorful mating display of some birds, like peacocks, to the building of nests by nearly all birds, these are the characters we use to define birds and make them popular study subjects. One peculiar aspect of some birds is communal nesting, where multiple breeding pairs lay eggs in the same nest. This most famously occurs in ostriches, who can have several females lay their eggs in one nest t