Where did you get the idea that copper rods can be used to find water? The hydrogen in the water is bound to the oxygen atoms. So Copper does not react with water. But air can react with it. Copper and oxygen in the air reacts to form copper oxide.
Liger is a hybrid offspring from two different species under the same genus. Under the genus ‘homo’, homo sapiens are the only existing species. We simply don’t have a compatible animal to cross with.