Author of 1970s/1980s series of novels about animal hunting brothers?

I'm trying to track down the author of a series of novels (possibly teenage focused) from the 1970s/1980s. They feature a pair of brothers who search the world for exotic animals to house in their fathers zoo/animal park. Typically each novel is centered around one geographic location such as the Amazon or Kenya. Unfortunately I can't even remember the names of any of the books. Does anyone have any idea who the author might be?