This audio story is brought to you by BirdNote, a partner of the 吃瓜黑料. BirdNote episodes air daily on public radio stations nationwide. 6960 Transcript: This is BirdNote. When summer sizzles, we look for ways to keep cool. Sip a cold one, turn up the air conditioning, or dress down to a pair of shorts and t-shirt. Birds lack these particular options. But in the case of the Toco Toucan of South America, evolution has come up with at least one alternative. Relative to its body size, the Toco Toucan has the largest bill of any bird in the world. It’s outsized, orange, and accounts for a full third of the body’s entire surface area. It’s also laced with blood vessels and has no insulation – features that make it a superb structure for getting rid of excess body heat. So blood pumps into the bill all the time. The hotter the weather, the farther out the blood goes. And the heat escapes through the bill’s thin outer layer. This...