dik-dik

[oblongata]

A small antelope known as a dik-dik (or dikdik), which has hind legs that are significantly longer than its forelegs and a crest on its head which flares when aroused or angered, has a common name that is classified by the four-letter surname of the naturalist who first observed and classified this species. What is that four-letter surname?

[paddywak]

not certain but I think it's Kirk

[Clanad]

More likely, Damara, since Kirk's, Swaynes' , Guenther's and Salt's are all sub-species of the Madoqua... Silver is also a sub-specie of the small creature...

[Clanad]

OK, now I see that your require four letters.... that would probably make it either a Kirk as suggested by paddywak or possibly a Salt...