Species which need to consume gaseous oxygen for their metabolism.
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A
C
D
M
O
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U
- UFO (Cars)
- Unnamed avian species (Zagubieni)
- Unnamed black-skin species (Lucky Fred)
- Unnamed blue-skined species (Flurgle Burgle)
- Unnamed blue-skined species (Lady Starblaster)
- Unnamed four-eyed species (Phineas and Ferb)
- Unnamed green-skined species (Penn Zero: Part-Time Hero)
- Unnamed insect species (Penn Zero: Part-Time Hero)
- Unnamed light blue-skin species (Penn Zero: Part Time Hero)
- Unnamed one eye reptile species (Penn Zero: Part-Time Hero)
- Unnamed species (Margaryna gagaryna)
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