What Happened to the Dodos on Easter Island?

The people of easter island used up all the trees to build giant stone heads that represented ancestors. This was part of an ancestor cult, a religious belief that kind of looks towards and worships ancestors and the dead. The living had to look after the dead via these statues by providing the right type of offerings in order for them to be respected. And how they elected leaders as a response to collapse is what interests me too.