Answer: UK
Notes: Paleontologists have discovered the fossilized upper molar tooth of Hippopotamus antiquus from Westbury Cave, in the UK. It is an extinct species of hippo that lived in Europe during a warm period between 2 and 1 million years ago. The species is said to had been much larger than the modern African hippo, weighing around 3 tons. It is known to have been more reliant on aquatic habitats.
