Measuring just 7.7 millimetres, Paedophryne amauensis is the smallest known vertebrate on Earth. Discovered in Papua New ...

These teacup-sized dogs are so tiny that sometimes you don’t even notice when someone is carrying one around in their purse. According to Guinness World Records, the smallest Chihuahua ever is named ...

We’ve all heard of the world’s most massive sharks, both past and present. The megalodon, the great white shark, and the whale shark get most of the attention, but did you know that there are a ...

Alex Dittrich does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond ...

Q. You wrote that blue whales are the largest mammals. What are the largest and smallest animals of other groups? What ecological problems do animals confront by being extremely big or extremely small ...