Warbie, a seven-week-old ring-tailed lemur is pictured yawning. The endangered lemur's birth on May 10 is being celebrated by staff at Bristol Zoo. Ring-tails are considered a vulnerable species because there could be as few as 10,000 of them left in their native Madagascar. Keepers say the cheeky primate is happiest when climbing the trees, riding piggyback on one of the grown-ups, or just sleeping in the sun.
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