Concept:An arboreal animal is one that lives, feeds, and moves mainly on trees.
Explanation:The word "arboreal" means related to trees, so such animals are specially adapted for life above the ground.
They often have strong limbs, sharp claws, or grasping tails to climb branches easily.
Among the given options, squirrels are commonly seen on trees, where they nest and search for food.
Ducks are water birds, pigs live on the ground, and rats usually stay in burrows or buildings.
Therefore, squirrels are the clear example of an arboreal animal in this question.
Other familiar arboreal animals include koalas, monkeys, sloths, and chameleons, but the correct option provided is squirrels.
Answer:A. squirrels