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Pueo - The pueo is also known as the Hawaiian short-eared owl.

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Pueo - They are most active during the day.

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ʻIʻiwi scarlet honeycreeper - Hawaii has many species of honeycreeper, including the 'i'wi, which uses its hooked beak to drink nectar.

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Hawaiʻi ʻamakihi honeycreeper - Another member of the honeycreeper family, the amakihi is widespread in Hawaii.

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Hawaiian hoary bat - This endangered species of bat only lives on Hawaiian islands. (Photo: CC BY 2.0)

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Hawaiian hoary bat - It is believed to be related to the North American Hoary Bat. (Photo: CC BY 2.0)

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Pebbled butterflyfish - These fish feed on coral, worms, and tiny crustaceans. They're endemic to Hawaii.

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Orangemargin butterflyfish - These guys can be found in reefs deeper than 200 ft, but only in the vicinity of Hawaii.

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Hawaiian monk seal - These cuties often live in the less inhabited islands of northern Hawaii, though they spend most of their time at sea.

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Hawaiian monk seal - Their population has been declining, and if nothing changes, they could face extinction in the near future.

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Hawaiian happy-face spider - These spiders feature a number of different patterns on their backs, but the best known looks like a widely grinning mouth. (Photo: CC BY 2.0)

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Hawaiian happy-face spider - The spiders are only found on four Hawaiian islands: Oahu, Molokai, Maui, and Hawaii. (Photo: CC BY 2.0)

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Nene - This species of goose is also Hawaii's official state bird.

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Nene - They often prefer to live far from the water on black lava.

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Hawaiian hawk - The bird was once a symbol of royalty in Hawaiian folklore.

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Hawaiian hawk - The hawks only breed on the Big Island, but have been spotted on other Hawaiian islands.

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Kamehameha butterfly - The colorful butterfly is Hawaii's official state insect. (Photo: CC BY 2.0)

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Kamehameha butterfly - Sometimes people call it "pulelehua," which is the Hawaiian word for "butterfly." (Photo: CC BY 2.0)

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Hawaiian coot - These birds build floating nests and then defend them aggressively from danger.

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Hawaiian coot - The species is considered endangered and the once-popular game bird is no longer fair game for hunters.

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Hyposmocoma fractistriata moth - This species of Cosmopterigidae moth is specifically endemic to Oahu. (Photo: CC BY 2.0)

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Hawaiian moth - Hawaii has a number of moths you won't find anywhere else in the world, including ones that eat snails when they are in caterpillar form.

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Hawaiian dascyllus - These fish prefer to hang out by coral reefs and rocky bottoms.

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Hawaiian dascyllus - After the female lays eggs, the male guards and aerates them.

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Koloa maoli - The Koloa Maoli, also known as Hawaiian ducks, have been part of the Hawaiian ecosystem for tens of thousands of years.

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Koloa maoli - One of the many threats to the continued existence of the koloa is the fact that mallard ducks brought to the islands will sometimes mate with the koloa, producing hybrid offspring.

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Hawaiian longfin anthias - These fish prefer to live in the reefs around the Hawaiian islands.

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Hawaiian longfin anthias - Sometimes people try to keep them in aquariums, but the fish are difficult to care for. (Photo: Flickr)

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Potter's angelfish - These guys are the only common angelfish you'll find in Hawaiian reefs.

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Potter's angelfish - They typically feed on algae.

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