Twitter is said to be named after a bird 'tweeting'
The name was inspired from the birds chirps, and it is the main reason why the twitter logo is a Bird.
Pigeons and doves
The Twitter icon is a little blue bird. Presumably they used a bird as they 'tweet'
Twitter's logo is a blue bird with "Twitter" written in lowercase text.
@realsimonbird
Twitter is a Social Site. In Twitter, you may only read news about companies or games you like. Twitter's logo is a Twitter Bird!
#teamfollowback is used for the bird.
TWITTER!!
"Twitter" literally means the chirps of birds, or short,high-pitched sounds; so the bird is a natural logo :)