In Queen Elizabeth National park in Uganda we saw a strange sight of a hippo turning round and round and resting on its back, big pink tummy exposed. We thought it might be ill but it soon became apparent what was happening when a large foot appeared beneath the tail. It took a lot more rolling around before a perfect little (well I say little ...) mini version of mummy hippo emerged. A lovely sight to witness.
(Canon EOS 450D 300mm lens)