Why would a tumor need its own blood supply? how can this harm other normal cells?

Interspecies hybridization

Explanation:

Differences in beak shapes tell us that all the finches eat the same type of food. Different finch beak shapes are evidence that all Galapagos finches shared a common ancestor a long time ago. Different finch beak shapes are evidence that over time, finch species adapted to different food sources on the islands.

Changes in the size and form of the beak have enabled different species to utilize different food resources such us insects, seeds, nectar from cactus flowers as well as blood from iguanas.