Animals World

List of animals on letter O

Octopuses and Squid

Octopuses and Squid

Type of animal science: Classification
Fields of study: Marine biology, zoology
Octopuses and squid belong to the order Octopoda, members of which have eight tentacles covered with sucker pads. They have two eyes and a well-developed nervous system and are considered among the most intelligent of all invertebrates.

Omnivore

Omnivore

Type of animal science: Anatomy, classification
Fields of study:Anatomy, entomology, ornithology, marine biology, zoology
Omnivores are animals that eat both plants and animals. They are found in all types of animals, including arthropods, fish, birds, and mammals. Omnivore diets may vary seasonally.

Opossum

Opossum

Type of animal science: Classification
Fields of study: Anatomy, zoology
Opossums are omnivorous mammals which are the only native marsupial in North America.

Orangutan

Orangutan

Type of animal science: Classification
Fields of study: Anatomy, conservation biology, wildlife ecology, zoology
Orangutans are large apes with orange to reddish-brown shaggy hair. They have very long arms and no tail. They survive solely in the jungles of Borneo and Sumatra, where their habitat has been destroyed to the point that they are listed as a threatened species.

Ostrich

Ostrich

Type of animal science: Classification
Fields of study: Anatomy, ornithology, physiology, population biology
The ostrich and its relatives are famous for their exotic appearance and for being flightless birds. They are the oldest type of bird alive today, dating back eighty million years to the age of dinosaurs.

Otter

Otter

Type of animal science: Behavior, classification, ecology
Fields of study: Ecology, wildlife ecology, zoology
Otters are found in many parts of the world where there is clean, flowing water. Otters are large members of the weasel family, the Mustelidae, which includes mink, skunks, and badgers.

Owl

Owl

Type of animal science: Classification
Fields of study: Anatomy, ornithology, physiology, zoology
Any of the Strigiformes, a group of birds with highly specialized characteristics for nocturnal activity, including soft feathers and enhanced hearing and eyesight.

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