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

As you've probably experienced firsthand, some mosquito species have a real taste for warm human blood.

So much so that if you raise them on it in the lab, they'll accept no substitute.

Fortunately, I don't get major reactions at all.

Brad Main is a mosquito geneticist at UC Davis and part-time mosquito meal provider.

So it's not too bad for me, but some people in the lab are itching pretty bad when they have

hundreds of mosquito bites on their arms.

Out in the wild, some species are less picky.

Takenofli's Arabiances, common in East Africa.

They'll feed on cattle, dogs, goats,

pigs, people, wherever they can find a warm meal. But what Maine and his colleagues wanted to know was

whether the bloodsucker's choice of victim might be genetically determined. So they sequenced

the genomes of 48 Arabiances mosquitoes from Tanzania, which had fed on either humans or cows.

And they found that bugs with cow blood in their bellies had one partially rearranged chromosome,

compared to those who'd snacked on human blood, which could explain the preferences in meal choice.

The studies in the journal Plos Genetics.

If that genetic switch really does make cows more

...