Gnus - not: wild beasts
The wildebeests, also called gnus, are a genus of antelopes, scientific name Connochaetes. They belong to the family Bovidae, which includes antelopes, cattle, goats, sheep and other even-toed horned ungulates
I just never heard the name wildbeests before, as a non-native English speaker I had immediately a picture of 'wild beasts', safari, elephants, tigers, lions in my mind...
Wildebeest is used in English too. There are a lot of Afrikaans names for animals used in English - springbok, hartebeest, duiker etc. Often there's more than one name used, such as wildebeest or gnu ... and apparently an impala (from Zulu, cognate with the Swahili word paa/pala) can also be called a rooibok, although I've never heard this.
They just emailed me to say my suggestion of "gnu" was accepted. It now works (May 2018).
Yeee... I need to use two dictionaries to get the meaning of this...beast :) Became - gnu.