Site looks nice, if anything but a online purchase module.
I think the categories are a complete overkill. On a weekly basis in this country you have about 5 new listings for venomous and another 10 or so for non venomous. They have broken it down to sub categories like there are going to be hundreds of listings? (
http://www.terraristik-anzeigen.de/ as an example). Just have venomous snake, non-venomous snakes, lizards etc.
The other problem with this is that people don't want to go to 3 different sites to view advertised animals. Neither do people want to list on three different sites. What they should do is aggregate the listings from SA reptiles and "other sites", as well as include new listings of their own. Otherwise it will likely never really take off.