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Birds are the only living dinosaurs left on Earth, and their behavior is as diverse as their feathers. From incredible intelligence to extreme physical feats, these winged wonders are much more than just pretty singers. Here are five fascinating facts about our feathered friends.

• Crows Can Hold Grudges: Research has shown that crows can recognize human faces. If you treat one poorly, it will remember you and even alert other crows to stay away from you. These grudges can last for years, proving that bird brains are actually quite sharp.
• The Heartbeat of a Hummingbird: These tiny birds have the fastest metabolism of any warm-blooded animal. A hummingbird’s heart can beat up to 1,260 times per minute. To keep up this energy, they need to eat about half their body weight in sugar every single day.
• Woodpecker Tongues Wrap Around Their Brains: To prevent brain damage from the high-speed impact of pecking wood, a woodpecker’s tongue is incredibly long and wraps around the back of its skull. This acts like a natural seatbelt or cushion for their brain.
• Pigeons Can Do Basic Math: In scientific studies, pigeons have shown the ability to count and sort objects in numerical order, similar to how primates do. They are much smarter than their reputation as city pests suggests.
• The Alpine Swift Can Fly for Months Without Landing: This amazing bird can stay in the air for up to 200 days straight. They eat, drink, and even sleep while gliding through the air, only landing when it is time to breed.