The Monkeyface Prickleback is living proof that "there are plenty of fish in the sea" doesn't always mean good news. With a face only a mother could love (and even she's iffy), it rarely ventures more than 15 metres from its home cave in the rocky reefs of the eastern Pacific coast.

Yet, looks aside, this eel's got skills: it can survive out of water for up to 35 hours, as long as it stays moist (perfect for those impromptu land adventures). It can grow to 76 centimetres – about the length of a baseball bat (though you'd probably have better luck hitting a home run with the bat). Plus, females can lay a whopping 46,000 eggs in one go (but maybe we don't need that many Monkeyface Pricklebacks in the sea).