The second definition of Warble in the Merriam Webster online dictionary shows it as a verb. It is an action. You've never heard of warbling?
Main Entry: 2warble
Function: verb
Inflected Form(s): war·bled; war·bling /-b(&-)li[ng]/
intransitive senses
1 : to sing in a trilling manner or with many turns and variations
2 : to become sounded with trills, quavers, and rapid modulations in pitch
3 : SING
transitive senses : to render with turns, runs, or rapid modulations : TRILL
hmm, I didn't know that. But a Warbler is still a kind of Bird.
Originally posted by: Darth ChaltabHAH!
I WAS RIGHT AND YOU WERE WRONG, WARBLER!!! MUAHAHA!
We were both right, and I was also wrong. It is a noun and verb.
Yay learned another word I'll probably never use...