What a fun concept! Following everyone else's example and bolding my preferred animal.
1: Gerenuk VS Impala
2: Leopard VS Serval
3: Red Wolf VS Maned Wolf
4: Grey Fox VS Red Fox
5: Red Deer VS Moose
6: Musk Deer VS Muntjac
7: Capybara VS Small Otter Species
8: Moloch Lizard VS Frilled Lizard
9: Masai Giraffe VS Eland
10: Saiga VS Addax
11: Secretary Bird VS Grey Crowned Crane
12: Crested Porcupine VS Meerkat
13: White Rhinoceros VS Black Rhinoceros
14: California Sea Lion VS Leopard Seal
15: Asian Lion VS Caracal
16: Nile Crocodile VS Alligator Snapping Turtle
17: Beaver VS Platypus
18: Shoebill VS Marabou Stork
19: Markhor VS Ibex
20: Victoria Crowned Pigeon VS Lady Amherst Pheasant
21: Great White Shark VS Thresher Shark
22: Ratel VS Wolverine
23: Tasmanian Devil VS Wombat
24: Tree Kangaroo VS Rock Wallaby
25: Spectacled Bear VS American Black Bear
1: Gerenuk VS Impala
2: Leopard VS Serval
3: Red Wolf VS Maned Wolf
4: Grey Fox VS Red Fox
5: Red Deer VS Moose
6: Musk Deer VS Muntjac
7: Capybara VS Small Otter Species
8: Moloch Lizard VS Frilled Lizard
9: Masai Giraffe VS Eland
10: Saiga VS Addax
11: Secretary Bird VS Grey Crowned Crane
12: Crested Porcupine VS Meerkat
13: White Rhinoceros VS Black Rhinoceros
14: California Sea Lion VS Leopard Seal
15: Asian Lion VS Caracal
16: Nile Crocodile VS Alligator Snapping Turtle
17: Beaver VS Platypus
18: Shoebill VS Marabou Stork
19: Markhor VS Ibex
20: Victoria Crowned Pigeon VS Lady Amherst Pheasant
22: Ratel VS Wolverine
23: Tasmanian Devil VS Wombat
24: Tree Kangaroo VS Rock Wallaby
25: Spectacled Bear VS American Black Bear