/ˈjo͞ovənl/
Adjective
1. Of a young bird, that has its first flying plumage. (wiktionary.org)
Noun, pl. juvenals
1. A juvenal bird. (wiktionary.org)
Word origin: From Latin iuvenalis “of or belonging to youth,” from iuvenis “a young person”
Note: Juvenal also refers to the Roman poet, Decimus Iunius Iuvenalis