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Tokyo is not so cold that only penguins will be comfortable in winter ;-) There are far colder cities in the world than Tokyo which also have African animals in their zoos (think Chicago, northern Europe, cities in Canada), so there are obviously measures in place to keep the animals comfortable. I think it is actually more of a problem for the cold-weather animals in summer here (polar bears etc) as they often show keepers giving them iceblocks on TV in summer.
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