The slow loris, a small primate native to Southeast Asia, may appear cuddly and cute, but it harbors a dangerous secret. This nocturnal animal has a gland in its elbow that produces a toxic secretion.

Then, with a quick lick, the oil secreted from glands in their elbow is mixed with saliva to produce a toxic concoction. A slow loris’s bite is so toxic it can kill a human. Not so cute.

But don’t be fooled—this tiny creature is one of the few poisonous mammals in the world. The slow loris has special glands on its arms that produce venom. When it licks or rubs this venom onto ...