Oh, could've been a pregnant rat. The news didn't seem to consider it. Too close to the concept of 'anchor babies'?

Anyhow, the rat is actually a clever and resourceful and tough and enduring beast. They make good pets, although I would choose a known domesticated variety over feral. They have been known to be affectionate and many have achieved employment in professional fields.

Turns out that brains we humans regard as small can be quite perceptive and intelligent. After all, who was it who indicated to sailors it was time to leave the ship?