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A cat in nature became alert in the grass

A cat in nature became alert in the grass

Cats in nature are always on the alert

Cats in nature are always on the alert

A dark, clear night. astronomers on the alert

A dark, clear night. Astronomers on the alert

A military man with a mask on his face with burning eyes on alert

A military man with a mask on his face with burning eyes on alert

Military equipment on the alert

Military equipment on the alert

Funny little men. danger warning

Funny little men. Danger warning

A flock of meerkats in the desert looking into the distance

A flock of meerkats in the desert looking into the distance

Sad dog in a red scarf

Sad dog in a red scarf

Antelope is a fast animal in the wild

Antelope is a fast animal in the wild

Antelopes in the wild in africa

Antelopes in the wild in Africa

Gopher basks in the sun

Gopher basks in the sun

Rodents are the most numerous order of the class of mammals of the chordate type

Rodents are the most numerous order of the class of mammals of the chordate type

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Quick to notice any unusual and potentially dangerous or difficult circumstances; vigilant. The state of being watchful for possible danger. Warn (someone) of a danger, threat, or problem, typically with the intention of having it avoided or dealt with.