I would love to see a clone of a wooly manmmoth! If you could get one—train it to do tricks—it could headline Ringling Brothers Barnum and Baily Circus! I would love to clone the passenger pidgeon—extinct now—they were said to taste great! Cone em’Raise em on Ranches, sell em to restaurants for rich folks to eat. Same with the dodo bird. There could well be a peck of money in bringing back lost animals.
Two things about the dodo:
First, there are multiple reports that it tasted terrible.
Second, it is urban legend (or perhaps a convenient eco-myth) that they were hunted to extinction. They built their nests on the ground, and rats and pigs on the island ate their eggs. That's how they went extinct. However, man brought the rats and pigs to the island, so man is ultimately still responsible for their disappearance.