Yelling Bird was a bird with a bad temper and a loud voice, which he used to spew profanities. He originated in Jeph Jacques' side-comic indietits before eventually becoming (almost) part of Questionable Content, usually appearing as filler comics when Jeph was too busy or ill to do a proper strip. Jeph retired the character in 2015.
He lived with a girl whom he only referred to as Sweet-Tits. He was also annoyed greatly by a bandicoot named Randy and a dog named Shelby. Yelling Bird and his companions did not appear (or hardly ever) with the rest of the cast, and it's possible that they didn't even exist in the same universe.
The species of Yelling Bird is the Dickcissel, so named for the sound of its song. The template used for Yelling Bird comics is a photo from the Birds of Oklahoma site.
He seemed to have some repressed memories, possibly due to a traumatic (and mysterious) event on June 14, 1987. When the date was mentioned, he violently denied that the day ever happened.
I am tired of Yelling Bird comics so there will be NO MORE OF THEM, goodbye you shitty bird.