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These include the collared aracari, a small toucan-like bird, with a yellow chest and enormous beak, as well as several members of the manakin family — small brightly colored forest birds known for elaborate courtship dances.

Back in the sampling tent, the scientists tweezed clumps of the manakin's breast feathers to be sent for analysis, before the bird is returned unharmed to the wild.

It was a male striolated manakin, with a little green puff of a body and a proud red crest.

As Balakrishnan and his colleagues reported at the meeting, a sweet tooth—or beak—may have set the stage for sexual selection in manakins.

In the case of both the manakin and the finch, although their displays initially appear simple and uninteresting to humans, females of the species pay close attention to male displays.