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| Black-chinned hummingbird (Archilochus alexandri) |
"My enemy's enemy is my friend" might be a cynical policy when it comes to government foreign relations, but it seems to work at least some of the time when it comes to genes (or maybe memes).
It has long been recognised by ornithologists that the nests of black-chinned hummingbirds in Arizona, USA, tend to be clustered around the nests of goshawks and Cooper's hawks, but the reason for this were not previously understood, and was maybe even somewhat counter-intuitive.
Now a team of researchers from Ecuador, Canada and the USA made detailed observations of the movements


















