Last updated at 06:26
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Pictures: Zoo worker swims with penguins

A zoo worker has taken a dip with the penguins he looks after inside their enclosure!
Making sure you get enough Omega 3 for the triathlon Rob?
Rob Thomas, the conservation and research manager for the Royal Zoological Society of Scotland swims at the penguin enclosure
He's been practising for the 1,500 metre swim that's part of the Olympic sized triathlon coming up this weekend.
Rob Thomas, the conservation and research manager for the Royal Zoological Society of Scotland swims at the penguin enclosure
Don't worry, we were completely confused when we first saw this too! But it's actually an Edinburgh Zoo worker called Rob Thomas who's been training for the London Triathlon in the penguin pool, trying to get fit for the event.
Rob Thomas, the conservation and research manager for the Royal Zoological Society of Scotland swims at the penguin enclosure
A triathlon is an athletic event that involves three stages: cycling, swimming in open water and running.
Rob Thomas, the conservation and research manager for the Royal Zoological Society of Scotland swims at the penguin enclosure
Rob enjoyed it, and he reckons the penguins did too: "As well as excellent training for me in outdoor water, my swims have also provided fantastic enrichment for our extremely curious and friendly penguins."
Rob Thomas, the conservation and research manager for the Royal Zoological Society of Scotland swims at the penguin enclosure