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#3 – The Smallest Etruscan Shrew
World's smallest mammal!
via upload.wikimedia.orgcomplain
This is the lightest known mammal. It weighs 1.8 grams (about 0.063 oz). Despite a small size, this shrew has an insatiable appetite. This is because Etruscan Shrew has extremely fast heart beating rate - 25 beats/s.
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