"There is the mammal way and there is the bird way." But the bird way is much more than a unique pattern of brain wiring, and lately, scientists have taken a new look at bird behaviors they have, for years, dismissed as anomalies or mysteries - what they are finding is upending the traditional view of how birds conduct their lives, how they communicate, forage, court, breed, survive. They are also revealing the remarkable intelligence underlying these activities, abilities we once considered uniquely our own.

Sy Montgomery's popular 2011 Orion magazine piece, "Deep Intellect", about her friendship with a sensitive, sweet-natured octopus named Athena and the grief she felt at her death, went viral, indicating the widespread fascination with these mysterious, almost alien-like creatures. Since then Sy has practiced true immersion journalism, from New England aquarium tanks to the reefs of French Polynesia and the Gulf of Mexico, pursuing these wild, solitary shape-shifters.

Birds are astonishingly intelligent creatures. In fact, according to revolutionary new research, some birds rival primates and even humans in their remarkable forms of intelligence. Like humans, many birds have enormous brains relative to their size. Although small, bird brains are packed with neurons that allow them to punch well above their weight.

In 1541, the brutal conquistador Gonzalo Pizarro and his well-born lieutenant Francisco Orellana set off from Quito in search of La Canela, South America's rumored Land of Cinnamon, and the fabled El Dorado, "the golden man". Driving an enormous retinue of mercenaries, enslaved natives, horses, hunting dogs, and other animals across the Andes, they watched their proud expedition begin to disintegrate even before they descended into the nightmarish jungle, following the course of a powerful river.

In 1528, a mission set out from Spain to colonize Florida. But the expedition went horribly wrong: Delayed by a hurricane, knocked off course by a colossal error of navigation, and ultimately doomed by a disastrous decision to separate the men from their ships, the mission quickly became a desperate journey of survival. Of the 300 men who had embarked on the journey, only four survived - three Spaniards and an African slave.