Why guillemot chicks leap from the nest before they can fly

Before they have the wing span to actually permit them to fly, young guillemots (also known as murres) leap hundreds of metres off towering cliffs and flutter down towards the sea, guided by their fathers. Scientists have ...

How to be winner in the game of evolution

A new study by University of Arizona biologists helps explain why different groups of animals differ dramatically in their number of species, and how this is related to differences in their body forms and ways of life.

How choosy should you be?

When animals choose their mates, how discriminate they are varies a great deal. For some male Mormon crickets, any female will do; in contrast, blue peahens rarely fall for the first cock courting them. Across nature, all ...

Invasive species may unexpectedly reduce disease prevalence

Humans are remarkably good at moving species around: We unwittingly carry stowaway organisms in our luggage when we fly, in our cars when we take a road trip, and on our bodies when we're simply taking a stroll.

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