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Only seven other zoological collections in the world keep greater bamboo lemurs.

The last fact wasn’t actually disappointing, but a point of zoological interest.

But there was more to the tweet than a zoological judgment.

Members of the public have been urged not to approach it but to contact the zoological society with information.

“The keepers have got lots of tricks up their sleeve to be able to count these animals,” zoological operations manager Dan Simmonds said.