Giraffe-like animals but with shorter necks (6)
I believe the answer is:
okapis
(Other definitions for okapis that I've seen before include "Animals similar to the giraffe but with shorter necks" , "They're similar to the giraffes but smaller" , "African mammals" , "Ok, Pa is wrong about the giraffe-type animals" , "They're like giraffes only smaller" .)