1.1K views · 66 reactions | Friday Feather Fact: The Toco Toucan’s enormous bill makes up 1/3 of its total body size, but only contributes to about 5% of the birds’ weight. A heavy bill would impair flight, so the inside of the toucan’s bill is mostly hollow, with a honeycomb-like structure for support. The bill also works as a portable air conditioner, with a network of blood vessels that help disperse excess body heat in the warm tropics. | Sylvan Heights Bird Park | Facebook