can this bring the extinct dodo birds back out of extinction?

I'm not sure about the dodo, but a previous answer had the mammoth comment at least partially right. DNA decays and breaks down just like the rest of a body after death, so any sample pulled from a dodo (like a stuffed one in a museum) would be pretty busted up. That being said, animals with close living relatives (like the mammoth or the North American lion, or many other large Pleistocene mammals) do have a possibility of resurrection.

Some scientists are trying to splice (combine) mammoth DNA with African elephant DNA and implant the "clone" into a captive elephant. These two species are similar enough that an elephant female could theoretically give birth to a mammoth.

Even if this works, it will unfortunately not bring these species truly out of extinction - their habitats are gone, and we can barely keep alive what species are left. It would most likely be a tourist attraction or a scientific study. Besides, animals learn a lot from their parents, and without parents of the same species, the "new" dodos or mammoths would never be what the once were.

If that worked nothing would be extinct, now would it?

a few months ago somehow they recreated a living mammoth, so i guess its posible

sounds like Jurassic park if you ask me