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Note: Some common names may appear more than once in the group below. This indicates that the same common name is being used for more than one scientific name.

Olympic Torrent Salamander (19)	One-toed Amphiuma (6)	Orange-bellied Narrow-mouth Frog (1)	Orange-canthal Shrub Frog (4)
Orange-eyed Tree Frog (5)	Orange-tailed Agile Salamander (4)	Orange-thighed Frog (13)	Oregon Ensatina (213)
Oregon Ensatina (21)	Oregon Ensatina (54)	Oregon Ensatina (35)	Oregon Ensatina (7)
Oregon Ensatina (34)	Oregon Ensatina (29)	Oregon Ensatina (70)	Oregon Salamander (3)
Oregon Slender Salamander (18)	Oregon Slender Salamanders (2)	Oregon Spotted Frog (82)	Oregon X Painted Salamander Intergrade (2)
Orejuela's Glassfrog (1)	Orejuela’s Glassfrog (1)	Oriental Fire-bellied Newt (59)	Oriental Fire-bellied Toad (37)
Oriental Ornate Narrow-mouth Frog (1)	Oriental Tree Frog (6)	Oriente Coastal Frog (1)	Oriente Streamside Frog (1)
Orinoco Lime Treefrog (1)	Orlov's Tree Frog (9)	Ornamented Pygmy Frog (1)	Ornamented Pygmy Frog (1)

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