larva images - Joel Sartore

A federally endangered Karner blue butterfly larva, Lycaeides melissa samuelis.

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A federally endangered Karner blue butterfly larva, Lycaeides melissa samuelis.

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A fishfly larva (Chauliodes pectinicornis) collected by the West Liberty University Crayfish Conservation Lab.

This insect was collected near Davis, West Virginia

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A fishfly larva (Chauliodes pectinicornis) collected by the West Liberty University Crayfish Conservation Lab.

This insect was collected near Davis, West Virginia

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Caterpillar of orange lacewing (Cethosia penthesilea) at Melbourne Zoo.

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Caterpillar of orange lacewing (Cethosia penthesilea) at Melbourne Zoo.

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Caterpillar of orange lacewing (Cethosia penthesilea) at Melbourne Zoo.

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Caterpillar of orange lacewing (Cethosia penthesilea) at Melbourne Zoo.

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Cruiser caterpillar (Vindula arsinoe) at Melbourne Zoo.

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Cruiser caterpillar (Vindula arsinoe) at Melbourne Zoo.

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Cairns birdwing caterpillar (Ornithoptera euphorion) at Melbourne Zoo.

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Cairns birdwing caterpillar (Ornithoptera euphorion) at Melbourne Zoo.

Larvae of the critically endangered (IUCN) and federally endangered American burying beetle, (Nicrophorus americanus) at the St. Louis Zoo.

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Larvae of the critically endangered (IUCN) and federally endangered American burying beetle, (Nicrophorus americanus) at the St. Louis Zoo.

Larva of the critically endangered (IUCN) and federally endangered American burying beetle, (Nicrophorus americanus) at the St. Louis Zoo.

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Larva of the critically endangered (IUCN) and federally endangered American burying beetle, (Nicrophorus americanus) at the St. Louis Zoo.

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Larvae of the critically endangered (IUCN) and federally endangered American burying beetle, (Nicrophorus americanus) at the St. Louis Zoo.

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Larvae of the critically endangered (IUCN) and federally endangered American burying beetle, (Nicrophorus americanus) at the St. Louis Zoo.

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Larvae of the critically endangered (IUCN) and federally endangered American burying beetle, (Nicrophorus americanus) at the St. Louis Zoo.

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Grub or larva of the brown rhinoceros beetle (Xylotrupes gideon) at the St. Louis Zoo.

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Grub or larva of the brown rhinoceros beetle (Xylotrupes gideon) at the St. Louis Zoo.

Picture of the caterpillar of the mourning cloak butterfly (Nymphalis antiopa antiopa).

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The caterpillar of the mourning cloak butterfly (Nymphalis antiopa antiopa).

Larval (grub) form of a scarab beetle known generally as a 'June bug', Osmoderma subplanata.

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Larval (grub) form of a scarab beetle known generally as a ‘June bug’, Osmoderma subplanata.

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Larval (grub) form of a scarab beetle known generally as a ‘June bug’, Osmoderma subplanata.

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Larval (grub) form of a scarab beetle known generally as a ‘June bug’, Osmoderma subplanata.

Larval (grubs) form of a scarab beetle known generally as a 'June bug', Osmoderma subplanata.

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Larval (grubs) form of a scarab beetle known generally as a ‘June bug’, Osmoderma subplanata.

A larva and a pupa of the European corn borer (Ostrinia nubilalis) at Spring Creek Prairie near Denton, Nebraska.

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A larva and a pupa of the European corn borer (Ostrinia nubilalis) at Spring Creek Prairie near Denton, Nebraska.

A larva of the European corn borer (Ostrinia nubilalis) at Spring Creek Prairie near Denton, Nebraska.

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A larva of the European corn borer (Ostrinia nubilalis) at Spring Creek Prairie near Denton, Nebraska.

A recently hatched federally endangerd Karner blue butterfly, Lycaeides melissa samuelis.

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A recently hatched federally endangerd Karner blue butterfly, Lycaeides melissa samuelis.

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Larval stage of the atlas beetle (Chalcosoma atlas) at the Omaha Henry Doorly Zoo. When grown into an adult, this type of beetle is able to lift 850 times its own body weight making it the strongest animal on earth compared to its body weight.

A zookeeper holds two larva of the atlas beetle (Chalcosoma atlas) at the Omaha Henry Doorly Zoo.When grown into an adult, this type of beetle is able to lift 850 times its own body weight making it the strongest animal on earth compared to its body weight.

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A zookeeper holds two larva of the atlas beetle (Chalcosoma atlas) at the Omaha Henry Doorly Zoo.When grown into an adult, this type of beetle is able to lift 850 times its own body weight making it the strongest animal on earth compared to its body weight.

A Miami blue butterfly (Cyclargus thomasi bethunebakeri) in larva form. This species is being captive bred at the McGuire Center at the Univ. of Florida. Thousands have been released into the wild in South Florida over the past three years. So far, results are indeterminate. Fewer than 250 exist in the wild, making it one of the rarest butterflies in North America.

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A Miami blue butterfly (Cyclargus thomasi bethunebakeri) in larva form. This species is being captive bred at the McGuire Center at the Univ. of Florida. Thousands have been released into the wild in South Florida over the past three years. So far, results are indeterminate. Fewer than 250 exist in the wild, making it one of the rarest butterflies in North America.