A kind of fish · also called Millionfish, Rainbow fish, Common guppy

About
The guppy is a tiny freshwater fish that grows to about the length of a standard paperclip.
Female guppies are noticeably longer and thicker than males, while the smaller males carry more elaborate fins. Compared to related livebearers like swordtails and mollies, guppies are among the smallest common aquarium species. Even at this minuscule size, females can give birth to dozens of fully formed, free-swimming fry at once.
From Wikipedia
The guppy, also known as the peacock fish, millionfish or rainbow fish, is a member of the family Poeciliidae and, akin to most New World members of the family, is classified as a livebearer. Male guppies, which are smaller than females, have ornamental caudal and dorsal fins.
Read more on Wikipedia →Text from Wikipedia’s “Guppy” article, CC BY-SA 4.0.
1 on the site
Weight
0.035 oz (1 g)
Quick answer
A guppy measures about 1.6 inches (4 cm) long, 0.5 inches (1.2 cm) tall, and weighs about 0.035 ounces (1 g). This makes it roughly the size of a paperclip and lighter than a single paper bill.
Typical figures, the same ones every comparison on the site uses; real ones vary.
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Next to anything: a person, a car, another fish.