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This is Scientific American's 60-second science. I'm Christopher in Taliatta.

The old expression bird brain, referring to a small or inadequate brain size,

it's not all that accurate. Take crows, for example, and other corvids like jays and magpies.

Many corvids have relatively large brains for their body size and can do amazing things.

Anerzmuller, an evolutionary biologist at the French National Science Research Council.

So this bird brain expression is a little bit simplified.

Some birds are actually so intelligent that they're informally referred to as primates with feathers.

But even among the smartest bird species, there's still natural variation in brain size,

which is a big deal when it comes to being hunted.

Mueller worked with a taxidermy shop in Denmark, which had data on nearly 4,000 birds brought in to be stuffed since 1960.

A lot of the birds were just found dead. They hit a window or a wire, and people picked

them up. But 300 of the specimens had been hunted. So Mueller's team then compared the brain

sizes of birds that got shot to those that didn't. They controlled for the birds age, sex, body size,

and species, and they found that the hunted specimens' brains were actually 5% smaller on average

than the brains of birds that died by other means. The surprising thing is that if you make

the similar kinds of analysis of liver size or heart size, there is absolutely

no difference there. So this is specific to the brain.

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