Starlings and Jays mimic other birds or mechanised sounds. Blue Jays even mimic larger birds such as hawks to let others of their species know there is a hawk, a predator, around or as a defence mechanism to deceive others and let them believe a hawk is around.
In the UK it is mainly males singing. Some female singers robins and dotterels, but in tropical climates, males and females will sing duets.
Over time, local dialects emerge. Birds of the same species only need to be isolated on an island or habitats to be separated by a forest or other barrier and birds will take on a certain song which will be passed on to the young until songs of the same species sounds very different – just like in our languages.
So what we actually hear when we wake up to bird twitter is flirting, a little bit of conversation and males boasting to win females over.
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