The most striking feature of the Keel-billed toucan (Ramphastos sulfuratus) is its huge, colorful beak, which is about 15 cm long and makes up about one-third of the bird's total length. One might think that such a large beak would significantly hinder or even prevent flying. However, thanks to its structure made of a hollow core composed of keratin, it is very light. For those interested and wanting to be surprised, I recommend searching on Google: toucan skull ;)