Cloning extinct animals is bad
1. It can give an organism an undesirable trait like a disease
2. Many organisms can die in the process
3. Cloning extinct animals can devalue mankind
4. Can give an animal a problem with one of their limbs
About Tiger spot
This website talks about an unstable version of the cloned species.
It explains how DNA may not work correctly if it is a cloned version.
Ehow talks about the health efficiency of the cloned animals
They explain the ethical issues of cloning