rain is a kind of precipitation & precipitation is a kind of weather ->  rain is a kind of weather  rain is a kind of weather & shelter can protect animals from weather ->  shelter can protect animals from rain  shelter can protect animals from rain & an animal needs to move to find shelter ->  moving to find shelter can protect an animal from rain  moving to find shelter can protect an animal from rain & protecting an animal has a positive impact on that animal ->  moving to find shelter can have a positive impact on an animal in the rain  moving to find shelter can have a positive impact on an animal in the rain & if performing an action has a positive impact on an animal, then that animal will likely perform that action -> some animals will likely move to find shelter in the rain