Certain kinds of salmon manage to travel 900 miles upstream from the Pacific ocean into central Idaho to have babies. And, seriously, judging by this gross picture of a dissected salmon, salmon brains are freaking tiny. I mean, look at that thing. If a salmon can get back upstream to have sex with salmon-chicks on that much brain, how come my highly evolved mammal-brain can’t figure out phone numbers?
Here’s an(other) example.