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Blue colors are common in tarantulas, such as this greenbottle blue tarantula.

Bluebottles, greenbottles, and all the flies of metallic luster were gathered at the Lucullan feast of corruption.

In Britain, they include the common bluebottle and greenbottle, and they are the forensic entomologist's raw material.

When cut into pieces the size of a hazel nut and handed over to the greenbottle's grubs, the coagulated albumen dissolves into a colorless liquid which the eye might mistake for water.

Nothing tells us that the grub of the greenbottle does not adopt this method of growing.