The otherwise adorable duck-billed platypus (Ornithorhynchus anatinus) has a venomous spur on its hind legs. The spur is only on the males and is non-lethal to humans but can be extremely painful. – WTF Fun Facts
Source: http://poisonousnature.biodiversityexhibition.com/en/card/duck-billed-platypus
WTF Fun Fact – Venomous Platypus
So they are venomous now? Good lord.