Animals can reason. Chimps and bonobos, for example, understand what they look like, and can see themselves in a mirror, something no other animals can do. Moreover, apes are flexible thinkers and flexibility is the key to reason. If one approach to solving a problem doesn't work, they will try others, as humans do. A squirrel will continuously bury and dig up nuts, even in a tropical climate where the food source is unending -- it will not react to changing circumstances by thinking flexibly and changing its ways. Apes and humans do.
Do animals know "good" and "evil"? Moral reasoning is strictly a human function.