'O' Natural World

Can you name the things in the natural world that begin with the letter 'O'?

By what other name is the fish-, seal- and penguin-eating 'Killer Whale' known?
Which wild cat native to South and Central America has an orange-yellow coat marked with black stripes and spots?
Which Eurasian poppy with ornamental flowers is the source of morphine and heroin?
Barn, Spectacled and Tawny are all names of which type of nocturnal bird?
Which mollusk has eight sucker-bearing arms, a sac-like body and no skeleton?
What name is given to a desert spring or similar water source?
Which American marsupial has a naked prehensile tail and hind feet with an opposable thumb?
Which semiaquatic, fish and invertebrate eating mammal has dense fur and webbed feet?
Which swollen edible bulb with a pungent taste and smell is used as a vegetable?
Which small oval fruit with a hard stone and bitter flesh is used as food and as a source of oil?
Which large antelope living in arid regions of Africa and Arabia has dark markings on the face and long horns?
Red, English and Sessile are all names of which tree of the genus Quercus?
Which mammal native to Central Africa is also called the 'forest giraffe' or 'zebra giraffe'?
Which bivalve mollusc is often eaten raw and may also be a source of pearls?
Which term applies to an animal or person that eats a variety of food of both plant and animal origin?
Which African flightless bird is the largest bird in the world?
Which complex flower is often showy or bizarrely shaped and has a large specialized lip and a spur?
Which large fish-eating bird of prey with long narrow wings and a white underside is also called a 'fish hawk'?
Which Asian ape with long red hair and long arms is nicknamed 'The Old Man of the Forest'?
Which cereal grain is most commonly used as a livestock feed?
Which domesticated animal also called a bullock is used as a draft animal?

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