FaunaFocus
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The great horned owl is not only the most formidable in appearance of all owls, but it is also the most powerful.

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The great horned owl's talons lock round limbs and hold the bird firmly to sleep.

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A secondary function of a great horned owl's hooting is its challenge to others of his sex.

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The great horned owl is common and widely distributed.

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Certain Indian tribes regarded the great horned owl as the very personification of the Evil One.

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The great horned owl is the largest of the common resident owls of the United States.

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Great horned owls have been known to act as if wounded as a protest against intruders to their nests with young.

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The ability of great horned owls to revolve their heads through 180° is frequently used to advantage.

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Great horned owls prefer large stick nests in fairly open situations over smaller, enclosed leaf nests.

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The great horned owl is the most deadly enemy of the crow, taking old and young from their nests at night.

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The great horned owl's favorite part of its prey to eat is the brains.

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The great horned owl is a nocturnal bird, most active in the dusk of the evening and on moonlit nights.

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Of the North American species, great horned owls are one of the first to nest in the spring.

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Great horned owls are not migratory, as they do not make regular seasonal journeys between breeding and wintering grounds.

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Male great horned owls have a challenging, deep, rich tone of hoot contrasting the higher and huskier notes of the females.

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The silent flight of the great horned owl is powerful, swift, skillful, and graceful.

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Because the sense of smell is not highly developed in the great horned owl, they kill and eat many skunks.

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At times the male great horned owl appears to hoot for the mere pleasure of hearing his own voice.

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The function of the great horned owls feathered ear tufts is unknown.

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Female great horned owls are larger than males and weight about 50% more.

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Great horned owl calls are divided into three main categories: hoots, chitters, and squawks.

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The vaquita can be saved from extinction.

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Vaquita conservation management and action has been largely ineffective at controlling vaquita mortality in gillnets.

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At the current rate of decline, the vaquita could be extinct by 2018.

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Vaquitas have probably always been rare.

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Highly-trained US Navy bomb-locating bottlenose dolphins are being used to locate vaquitas.

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The oldest vaquita was estimated to be 21 years of age.

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As well as gillnet entanglement, the vaquita is vulnerable to several other potential threats.

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Mortality in gillnets has long been recognized as the most serious and immediate threat to the vaquita's survival.

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The vaquita and the totoaba, a large long-lived fish species in the croaker family, have much in common.

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The demand for dried totoaba swim bladders is threatening not just the totoaba but also the vaquita.

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There are less than 30 vaquita individuals left in the wild.

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The vaquita's population is declining rapidly, with a decline of nearly 50% since 2015.

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Most biological and ecological information of the vaquita is unkown.

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The mating system and social structure of the vaquita have not been studied.