Not Good at Math? Blame Your Inner Fish
Apparently female mosquitofish can only count to four. How do you test that, well the people at university of Padua in Italy came up with a very cool research design to figure it out:
When males bother females, the females try to flee to the biggest group of nearby females. When given the choice between two groups — one with three other fish and another with four — the females consistently choose the group with four. When the choice is six vs. seven, they act like they can’t tell the difference. (Although maybe they count that high and they just don’t care about six vs. seven.)
