Final answer:
A turtle swimming close to a raft would typically be exhibiting exploratory behavior or looking for a place to rest or find food.
Step-by-step explanation:
When the second turtle swims close to the raft, it is likely engaging in exploratory or opportunistic behavior. Turtles are known to be curious about their environment and may approach objects in the water to investigate whether they can provide food, rest, or shelter. In some cases, rafts or debris floating on the water's surface could offer a temporary resting spot for a turtle, especially if the animal has been swimming for an extended period and needs to conserve energy.