tornado watch

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Aurochs. Bos primigenius. Skeleton. Extinct animal. Skeleton of an Aurochs, an extinct wild ox.

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Periodical Cicada, Adult, Magicicada spp. Requires 17 years to complete development. Nymph splits its skin, and transforms into an adult. Feeds on sap of tree roots. Northern Illinois Brood. This brood is the largest emergence of cicadas anywhere

Why Do Some Cicadas Appear Only Every 17 Years?

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Aspirin pills.

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Portrait of a mountain gorilla at a short distance. gorilla close up portrait.The mountain gorilla (Gorilla beringei beringei)

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tornado watch

meteorology

Learn about this topic in these articles:

prediction of tornadoes

In tornado: Prediction and detection of tornadoes
…to the public as a tornado watch. A tornado warning is issued when a tornado has been spotted either visually or on a weather radar.
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