* Giraffe: The giraffe's long neck allows it to reach high into the trees to eat leaves, a food source that other animals can't easily access. Its long legs allow it to cover long distances in search of food and water.
* Hummingbird: The hummingbird has a long, thin beak and a long, slender tongue that are perfectly suited for reaching into flowers to drink nectar. Its wings can beat incredibly fast, allowing it to hover in place while feeding.
Let me know if you'd like more examples!