cats purring illness pain pleasure

A cat can purr when it is in pain

Cats purr when relaxed or eating, but they may also purr when sick or apparently in pain. Mother cats can purr around nursing kittens as well. Purring alone therefore does not prove that a cat is happy.

Bioluminescence becomes much more common in the deep ocean

2.5% near coasts vs 76% in the deep eastern Pacific

Only about 2.5% of organisms in coastal ocean habitats are estimated to make their own light. In the deep eastern Pacific, about 76% of the main animal groups include light-producing species.

Viruses can kill bacteria and feed other life

Some viruses in water infect bacteria and break the cells open. The material released from the dead bacteria becomes food and nutrients for other bacteria and algae. Viruses can therefore help recycle material through aquatic ecosystems.

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cats purring illness pain pleasure

A cat can purr when it is in pain

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