What are the animals that can easily adapt to its environment?

Well, not all animals adapt to their environment. It actually depends on what specific animal your talking about. Each animal has to have an ideal amount of space, and it needs to have a supply of food which will allow it to not starve to death. If the animal hibernates (ex. bear) then you will have to find a area plenty with food which will allow the animal to eat in order to save food for the winter. All animals are found in "groups". So you'll eventually need to find enough space for the animal to roam and reproduce. All animals take time to adapt to their environment so if you have an animal, you'll have to work on it to make it feel comfortable in it's "home".