An animal that must continually eat to live.
The Eurasian pygmy shrew has a very high metabolism.
Active throughout the day and night, the Eurasian pygmy shrew lives in undergrowth and leaf litter and lives off small insects and invertebrates. It has an average weight of 4 grams and has one of the highest metabolic rates of any animal, meaning it must eat at regular intervals — every two hours or so
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From Wikipedia)
Can regenerate body parts