What would happen if different species of animals to interbreed? Like say a lion and tiger. A crow and dove. Human and chimp. Dog and cat. Horses and cows. Chickens and ducks. Or even something totally different like Hamsters and frogs. What are the limits of type of animal's ability to breed? Do all animals have to breed with the same kind? How did that happen evolutionarily? Evolution seems discrete instead of consistent. Like if animal A evolved into animal B. Then animal B evolved into animal C.