Naked mole-rats invade neighboring colonies and steal babies

When the burrow is king, it may pay to be part of a huge, aggressive army

Naked mole-rats in a pile

Naked mole-rats (Heterocephalus glaber) form a cozy pile. The burrowing rodents are native to East Africa and have a predilection for making war.

Ger Bosma/Alamy Stock Photo

Naked mole-rats — with their subterranean societies made up of a single breeding pair and an army of workers — seem like mammals trying their hardest to live like insects.