Field said, for example, that no one is required to count each and every leafcutter ant — an estimate based on the exact number of ant colonies will just have to do.
He is particularly proud of two additions counted in the new census: Harry, the first warthog born at the London Zoo in roughly a century, and Conchita, an extremely rare white-naped mangabey monkey born in April by cesarean section.
The survival of her species is very much in doubt because of the threat to its habitat in West Africa, making the survival of Conchita even more important, Field said.
“She’s so endangered we needed to hand-rear her,” he said.
“She’s now been integrated back into the group. That’s a tremendous success,” he said.
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