Otter licking a fish lolly!

The image caption read 'An otter enjoys a fish lolly after having a swim at the Biopark in Valencia, eastern Spain'.

Animal keepers do this to keep the animals alert and active - instead of throwing the bananas into the monkey cage, why not freeze them in a bucket of water so the monkeys can make a game of it?

Given otters are so playful, it's not surprise Zoos use this trick for em! Heck, they do it for polar beers!

What else do they feed Polar beers at the Zoo?