I have no clue. I'd never them before so I figured that they were ruffs. The other signed birds were Indian Pygmy goose and European blackbird, but this is obviously neither.
It is a thick-knee, but definitely not B. grallarius. I'm not 100% on which species it is though so hopefully someone else can help. Note: cross-posted with Maguari
A tricky one and a picture of the complete wing surtainly would help. For the moment I would also say B. senegalensis.
This is the only photo I have, sorry. I was hurrying through the park a bit- I still had another zoo to go to, which was two hours away. I'll able it as Senegal thick-knee for now, thanks for all the help .