It is best to use single word searches, from there you can filter if the result is large.
Antelope will show all antelope species, but will also show zebra (African equines) as they are often together with wildebeest.
Bird will show all bird species.
Cat will show all lions, cheetahs, leopard and so on.
Dog will show hyenas, jackals, wild dogs etc.
Lion will show lions, lionesses and lion cubs.
Elephant, hippo, rhino, zebra, panda, crocodile, buffalo, giraffe, warthog, bear, monitor, primate, gorilla, baboon ……
When in a gallery, hover your cursor of any image to get information like the common and scientific name of the animal, and also where the photograph was taken.