ABSTRACT To maximize fitness, breeding adults may respond to environmental processes by adjusting their progeny’s sex ratios. R. A. Fisher in 1930 hypothesized that frequency-dependent selection would ...

A recent study has shown that juvenile songbirds react to hearing the songs they will eventually produce as adults, even when they are as young as 12 days old. Experiments conducted on nestling pied ...

A recent study, published in Current Biology, led by researchers at Stockholm University and Uppsala University, has shown that juvenile songbirds react to hearing the songs they will eventually ...

Birds feast on bugs, not the other way around. But that role-reversal is what Mahmood Kolnegari of the Avaye Dornaye Khakestari Institute, in Iran, and Connor Panter of the University of Nottingham, ...

This is a preview. Log in through your library . Abstract We collected and identified 1852 prey items from 89 boluses delivered to 62 nestling tree swallows (Tachycineta Bicolor) at 14 nests in an ...

Unable to fly, nestling birds depend on their parents for both food and protection: vocal communication between parents and offspring helps young birds to determine when they should beg for food and ...