The flashy beak of the playfully over-sized toco toucan, according to the thewritingengineer.com, has a unique ability to regulate blood flow as a solar heat collector during cool periods and as a thermal release mechanism to prevent overheating during hot weather. The dark-colored collector panels of a solar water heating system, veined with pipes circulating heat transfer fluid, serve the same purpose. Engineers are now looking to more closely mimic this design from nature to enhance the efficiency of current designs.