Dylan Dreyer visits Venezuela's Orinoco River, one of the longest, largest rivers in the world; a puma uses the river as a hunting ground; four-eyed fish and fiddler crabs make their homes in the river; red howler monkeys hang out in the trees above.

Dylan Dreyer visits Patagonia in South America, where penguins almost outnumber people; beavers build dams that affect woodpeckers and other birds' lives; glaciers and ice fields host a range of creatures including flamingos, guanacos and pumas.