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This collection of terms and their definitions should help as you try to understand the vast language that has developed for the study of animals. Terms in this category begin with the letter 'J'.

Glossary index: A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z

Please refer to the Glossary Citations page for details about sources used for glossary entries.
Juvenile
"A bird wearing its juvenal body feathers. In most songbirds juvenal feathers are molted within a few weeks of leaving the nest; thus songbirds are generally considered to be juveniles for only a short period." (Source: Sibley)
Juvenal
"Refers to the first plumage attained after a bird loses its down feathers." (Source: Sibley)

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