Adorable though they may be, these marsupials have been known to add a dash of protein to their predominantly herbivorous diets by horking down the occasional bird brain. Unconcerned with waste management, tree kangaroos generally discard the rest of the corpse after consuming the gray matter.
The great tit's powerful beak is an excellent nut-smashing tool. It also doubles as a handy-dandy bat-skull-crusher. Seeds and insects are the favored cuisine, but this songbird is a devout opportunist. Specimens have been spotted scavenging corpses and breaking into milk bottles to get through the lean times, and when things get particularly desperate, they'll even decapitate hibernating bats before eating their brains (along with a few other organs).
3. Sea squirts
Enigmatic and often beautiful, sea squirts are a diverse group of filter-feeding marine invertebrates scientifically known as "tunicates." Their life cycle is rather intricate, and at one point during this metamorphosis, they'll literally devour their own brains. Luckily, this occurs after the creatures have stopped needing them.
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