I was brought up to believe referring to a woman as a ' bird' is quite rude and belittling. Eg I saw him with his bird the other day.
What his new birds name ?
My husband disagrees - he thinks it's a term of endearment / description and just a colloquialism in certain parts of the country.
I'd say that's true of duck eg ' Ay up me duck ' but not convinced about bird. I don't want my teenage son referring to girls as birds but I'm told I'm being OTT.