Jane wrote:

>>>>Is the correct term "juvenal" or "juvenile" or are they both correct
in different contexts? And if so, what are the contexts?<<<<

I noticed the great responses, but what I found most useful (guess I'm dumb)
was the following from the Glossary for Birds of North America Author
Guidelines (sent to authors by the editors of the series):

"Juvenal plumage: The first generation of true (pennaceous) contour
feathers. The feathers are usually less closely-knit, and differently
colored than those which will follow. Acquired by the Prejuvenal molt (i.e.,
replacement of natal down in species which have a downy plumage) and
_usually_ lost by the First Prebasic molt (but there are exceptions). Do not
confuse with juvenile, a general term for a young bird that has not reached
sexual maturity."

As you can see, they forced me into learning the Humphrey-Parkes terminology
too...

I know it's a late response, hope it helps nonetheless.

Martin Muller, Seattle
MartinMuller at email.msn.com