Certain antelope (5)
(Other definitions for gnu that I've seen before include "hitherto unknown, we hear" , "Animal" , "Large heavy antelope" , "animals" , "Strange gun for an antelope" .)
(Other definitions for eland that I've seen before include "African mammal" , "Antelope seen by Africans" , "Animal's" , "One browses in the African plain" , "Wild beast" .)