One of the tiny baby three horned chameleons which have hatched from eggs at Exmoor Zoo. See SWNS story SWLITTLE; At about 3 centimetres long the baby Johnston?s chameleons spent 16 long weeks developing from an embryo and have just emerged from their leather like egg shell. The babies are identical miniatures of their parents which can attain sizes of up to 30 centimetres or more. The curator Danny Reynolds at Exmoor zoo said ?two things make these babies just that bit extra special. They are probably the first of this species ever born in captivity within UK zoo?s and the fact that their parents had been rescued from an illegal shipment on-route to the Czech Republic. The Johnston?s chameleon only occurs in the Western branch of the African Rift valley ? the Albertine Rift and is extremely rare in captivity?.