Colorful bands were also placed on the parrotlets to track the individual birds and their relationships. They found dead baby birds in the nest without a clear indication of what had killed them.

It was only a couple years into tracking the parrotlets and studying their behaviors that researchers started to find nests filled with dead baby parrotlets, or nestings, leading the team to focus ...

During that time, around 9% of the nests saw adult parrotlets attacking baby birds or eggs. More than two-thirds of the attacks seemed to be driven by housing shortages: bonded pairs that had not ...