Changing Planet

Pictures: 6 Ridiculously Tiny Creatures

The discovery of a ridiculously tiny species of wasp in Costa Rica might be pushing the limit on just how small an insect can get.

The species, named Tinkerbella nana after Peter Pan’s miniscule assistant, averages 250 micrometers long. That’s 0.01 of an inch—little wider than the diameter of a human hair.

new fairyfly picture
The new fairyfly is named after Tinkerbell. Photograph courtesy Jennifer Read


T. nana is a type of wasp known as a fairyfly (Mymaridae). Don’t be fooled by its sweet-sounding name, small size, or the delicate fringe on its wings—T. nana and other fairyflies are parasites that live on the eggs of other insect species. (Also see “Parasitic Wasp Swarm Unleashed to Fight Pests.”)

Finding such small insects is no easy task—researcher John Huber of Natural Resources Canada and entomologist John Noyes of the Natural History Museum in London, England, found the fairyflies only by sifting through leaf litter and debris, looking for eggs. Huber and Noyes recently published their find in the Journal of Hymenoptera Research.

Despite its microscopic size, T. nana isn’t the smallest known insect. That particular honor goes to Kikiki huna, a species of fairyfly found on Hawaii. This fly is only half as long as T. nana, and scientists don’t know whether it’s possible for insects to get any smaller.

Meet some other members of the animal kingdom known for their remarkably petite physiques.

Smallest primate. Southeast Asia’s pygmy tarsiers (Tarsius) and Madagascar‘s mouse lemurs (Microcebus) seem to be in a running competition for world’s smallest primate.

tarsier picture
A tarsier munches on an insect in the Philippines. Photograph by Erik Sellgren, Your Shot


At approximately 4 inches (10 centimeters) long, the pygmy tarsier can fit inside a person’s fist, and full-grown adults frequently weigh in at less than two ounces (57 grams). Mouse lemurs have a combined head, body, and tail length of less than 10.6 inches (27 centimeters), according to the National Primate Research Center at the University of Wisconsin.  The smallest mouse lemur, M. berthae, weighs about 1.1 ounces (31 grams). (Read about new mouse lemurs discovered in 2006.)

A new species of mouse lemur found in Madagascar. Photograph by Mark Thiessen, National Geographic
mouse lemur picture
Primatologist Mireya Mayor holding a newfound mouse lemur in Madagascar. Photograph by Mark Thiessen, National Geographic


Smallest vertebrate. The world’s smallest vertebrate, a frog known as Paedophryne amanuensis, was discovered in 2009 in Papua New Guinea. The frog measures only 0.3 of an inch (7.7 millimeters), according to a 2012 study in the journal PLoS ONE.


smallest frog picture
Dwarfed by a dime, Paedophryne amauensis inhabits New Guinean rain forests. Photograph courtesy Christopher Austin


Scientists found the frog the way they found T. nana—by sorting through leaf litter, although no one currently knows exactly what it eats or how it lives.

Smallest mammal. The Kitti’s hog-nosed bat (Craseonycteris thonglongyai), a.k.a. the bumblebee bat, has been dubbed one of the world’s smallest mammals. A threatened native of Thailand and Myanmar (Burma), the bumblebee bat weighs in at 0.071 of an ounce (2 grams) and measures only 1.1 to 1.3 inches (2.8 to 3.3 centimeters) in length.

bumblebee bat picture
Kitti’s hognosed bat, or the bumblebee bat, is the world’s smallest bat. Photograph by Merlin D. Tuttle, Science Source


Smallest bird. Continuing with the bee theme, meet Mellisuga helenae, the bee hummingbird, which lives on Cuba and nearby islands. Weighing 0.056 to 0.071 of an ounce (less than 2 grams) and measuring 2.0 to 2.4 inches (5 to 6 centimeters) long, M. helenae has won the title of world’s smallest bird. Not only is it bee-size, M. helenae enjoys feeding on nectar like its namesake. Unlike a bee, however, M. helenae has bright, iridescent feathers.

bee hummingbird picture
A bee hummingbird perches on a twig in Cuba. Photograph by Steve Winter, National Geographic

Tell us—what small critters have you come across?

Carrie is a freelance science writer living in Virginia. When she's not writing about cool critters, she's spending time outside, drinking coffee, or knitting. You can visit her website at
  • b

    A small parasitical wasp hovering around my front porch light. It was a male as it had no ovipositor. It had a tiny waist maybe 3 hairs wide. It was very delicate looking. I looked it up and it was a species of brachonid wasp.

  • Indrani ghosh

    Which the smallest reptile?

  • Sara

    I so wish I could have a mouse lemur. How cute!!!

  • In Park

    Nature’s wonder. ^^*

  • Frodkin

    My mum was pretty short and had a sharp temper…

  • Sam

    I like seeing bugs with my magnifying glass

  • Tanner

    As a young boy I remember playing around a swamp like body of water on my friends property and seeing small copper-colored frogs, about the size (maybe double) of the Paedophryne pictured above.

  • Richard Stalter

    It’s amazing to think of all the types of animals that have yet to be discovered; especially in the arthropod family.

  • Sudarsan

    That’s the beatuy of Nature. Amazing to see these tiny tots actualy co-exist on this Earth!!

  • juanita m

    we have a tiny bird here in the backyard, it’s about 3in long irridesant blue-green in color. don’t think it’s a humming bird.

  • Ahmed Ashraf

    Oh what else god left for us to Discover in the future , Allah the great.

  • Eddie Queue Cuna

    Philippine tarsiers are night creatures: they’re looking for food during night time. They are carnivorous and mostly feed of insects. I have the opportunity to visit the island of Bohol, Philippines where tarsiers are housed in a huge bird cage. We were told not to take flash photography because tarsiers are sensitive to flashing lights.

  • Alberto Pelis S.

    The astonishing amazing Nature tecnolgies…


    NICE PIC……..

  • ahnaf tazwar

    Awesome creatures

  • Andrew

    Wonderful creation of God !

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