Juvenile images - Joel Sartore

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BIR015-00247

A two-day-old killdeer chick (Charadrius vociferus vociferus) at Rogers Wildlife Rehabilitation in Hutchins, TX.

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A two-day-old killdeer chick (Charadrius vociferus vociferus) at Rogers Wildlife Rehabilitation in Hutchins, TX.

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A juvenile song sparrow (Melospiza melodia euphonia) at Rum River Central Park. This is a bird that was hatched this year.

This bird was caught and banded as part of a nation-wide study of birds called MAPS (Monitoring Avian Productivity and Survivorship) coordinated by the Institute for Bird Populations.

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BIR049-00130

A juvenile song sparrow (Melospiza melodia euphonia) at Rum River Central Park. This is a bird that was hatched this year.

This bird was caught and banded as part of a nation-wide study of birds called MAPS (Monitoring Avian Productivity and Survivorship) coordinated by the Institute for Bird Populations.

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BIR049-00129

A juvenile song sparrow (Melospiza melodia euphonia) at Rum River Central Park. This is a bird that was hatched this year.

This bird was caught and banded as part of a nation-wide study of birds called MAPS (Monitoring Avian Productivity and Survivorship) coordinated by the Institute for Bird Populations.

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A juvenile banded newt (Ommatotriton nesterovi) from a private collection.

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A juvenile banded newt (Ommatotriton nesterovi) from a private collection.

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A juvenile African civet (Civettictis civetta australis) named ‘Honda’, age eight weeks, at Zooville USA near Plant City, Florida.

This civet originated from the Limpopo Province, South Africa

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A juvenile African civet (Civettictis civetta australis) named ‘Honda’, age eight weeks, at Zooville USA near Plant City, Florida.

This civet originated from the Limpopo Province, South Africa

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A juvenile African civet (Civettictis civetta australis) named ‘Honda’, age eight weeks, at Zooville USA near Plant City, Florida.

This civet originated from the Limpopo Province, South Africa

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A juvenile African civet (Civettictis civetta australis) named ‘Honda’, age eight weeks, at Zooville USA near Plant City, Florida.

This civet originated from the Limpopo Province, South Africa

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ANI051-00272

Seven juvenile Virginia opossums (Didelphis virginiana virginiana) at the WildCare Foundation, a wildlife rehabber in Noble, Oklahoma.

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A juvenile North American beaver (Castor canadensis) at the WildCare Foundation, a wildlife rehabber in Noble, Oklahoma.

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A juvenile, critically endangered brush-tailed bettong (Bettongia penicillata) named Bo, at Cub Creek Science Camp in Rolla, MO.

This joey has been out of the pouch for 12 weeks and is about 20-weeks old.

Cub Creek Science Camp is a residential animal and science summer camp located in central Missouri. Here children from all over the world come to learn about the Earth’s creatures and to gain an appreciation for science and nature.

Picture of baby little blue penguins (Eudyptula minor) at the Cincinnati Zoo.

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BIR036-00052

Baby little blue penguins (Eudyptula minor) at the Cincinnati Zoo.

A critically endangered and federally endangered, six-week-old female baby gorilla (Gorilla gorilla gorilla) at the Cincinnati Zoo.

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A critically endangered and federally endangered, six-week-old female baby gorilla (Gorilla gorilla gorilla) at the Cincinnati Zoo.

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Three juvenile eastern cottontail rabbits (Sylvilagus floridanus) at the Carolina Wildlife Center, a place that rescues and rehabilitates injured and orphaned wildlife.

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Baby aye-aye (Daubentonia madagascariensis) named Tonks, 16 days old, at the Denver Zoo.

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Sumatran tiger cubs (Panthera tigris sumatrae) at Tierpark Berlin.

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Sumatran tiger cubs (Panthera tigris sumatrae) at Tierpark Berlin.

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BIR069-00041

A federally endangered, juvenile, female, Elliot’s pheasant (Syrmaticus ellioti) at Tierpark. This species is listed as near threatened on the IUCN Red List.