Thanks for the clues! I think I've identified the right species now for all but one.
1 Bonobo (Pan paniscus)
2 Jamaican tody
3 Silvery pigeon
4 Blue-billed curassow
5 Lumholtz's tree kangaroo
6 Sun-tailed guenon
7 Cuban crocodile (Crocodylus rhombifer)
8 Candy-stripe loach
9 Pirapitinga (Piaractus brachypomus)
10 Blue-eyed cockatoo
11 Taita thrush
12 American alligator
13 Japanese serow
14 Galapagos Blue-footed booby
15 Tuatara
16 ???
17 Pronghorn
18 Butterfly lizard (Leiolepis sp.)
19 Patagonian mara
20 Tongan megapode
Problem with 18 is I found the exact image used, and the sites it's on (there are many) tag it as just Leiolepis Cuvier, meaning it's only identified to genus level. I couldn't find what the identifying features of each species are, so I can only surmise that this is a part of the challenge and perhaps the odd one out for some reason?
Try as I might, I can't identify 16 other than it's some sort of desert viper, and I'm guessing by your clue that it's not in the genus Bitis. It doesn't seem to fit Cerastes either.
My observation is that most of the species are endangered or vulnerable, but @gentle lemur has already suggested that. I don't see any other links.
1 Bonobo (Pan paniscus)
2 Jamaican tody
3 Silvery pigeon
4 Blue-billed curassow
5 Lumholtz's tree kangaroo
6 Sun-tailed guenon
7 Cuban crocodile (Crocodylus rhombifer)
8 Candy-stripe loach
9 Pirapitinga (Piaractus brachypomus)
10 Blue-eyed cockatoo
11 Taita thrush
12 American alligator
13 Japanese serow
14 Galapagos Blue-footed booby
15 Tuatara
16 ???
17 Pronghorn
18 Butterfly lizard (Leiolepis sp.)
19 Patagonian mara
20 Tongan megapode
Problem with 18 is I found the exact image used, and the sites it's on (there are many) tag it as just Leiolepis Cuvier, meaning it's only identified to genus level. I couldn't find what the identifying features of each species are, so I can only surmise that this is a part of the challenge and perhaps the odd one out for some reason?
Try as I might, I can't identify 16 other than it's some sort of desert viper, and I'm guessing by your clue that it's not in the genus Bitis. It doesn't seem to fit Cerastes either.
My observation is that most of the species are endangered or vulnerable, but @gentle lemur has already suggested that. I don't see any other links.