Over the years he has been up close to some of the most amazing creatures in the animal kingdom - but can you guess what they are in this picture quiz?

To celebrate World Heart Day, we're inviting you to try your best at our heartfelt animal quiz. Animals come in all shapes and sizes... and so do their hearts! Can you guess how big these animals ...

By living in large groups, they gain both protection against becoming another animal’s meal and more opportunities to breed. Among omnivores, primates are known for their high intelligence ...