Land mammal: The bumblebee bat tips the scales at about 2 grams and measures between 30 and 40 millimeters as an adult.
Marine mammal: Sea otters weigh between 35 and 90 pounds.
Bird: The hummingbird, which grows to only 2.5 inches long and weighs only 0.06 ounce.
Fish: The Paedocypris progenetica, which was recently discovered in Indonesia, measures just over 1/3 of an inch long.
Reptile: The British Virgin Islands gecko is about of an inch long when full grown.
Insect: Fairyflies are only about 1/5 of a millimeter long.
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