Including its bill, the Keel-billed Toucans ranges in length from around 17 to 22 inches (42–55 cm). Their large and colorful bill averages around 5-6 in (12–15 cm). This is about one-third of its length. It weighs about 380-500 grams (13.4 oz.-1.1 lbs.) While the bill seems large and weighty, it is in fact a spongy, hollow bone covered in keratin, a very light and hard protein. 