Greater roadrunners, Geococcyx californianus, are native to the American southwest, southern California and northern Mexico. These birds are ground-dwellers and have omnivorous dietary requirements. Along with tarantulas, a greater roadrunner's diet includes insects, lizards, snakes, mice and scorpions. These birds are able to retain water from food they eat; if they retain enough water, they are able to go days without drinking. When killing tarantulas, greater roadrunners will grab their intended victim and beat it against a hard surface until it dies. Tarantulas rarely outrun the greater roadrunner, which runs up to 19 miles per hour.
The California towhees', or Pipilo crissalis, native habitat is California and western Mexico. These birds grow up to 12 inches tall. California towhees are omnivorous and primarily eat berries, nuts and seeds. Although grasshoppers and beetles are the bird's primary invertebrate targets, California towhees occasionally prey on spiders, including tarantulas. When hunting, these birds use a double-scratch technique. California towhees initially run toward leaves, and then quickly jump backwards after seeing what is underneath the leaves. The bird proceeds to stomp the ground twice and waits for prey to emerge.
Known for their colorful bills, toucans are tree-dwellers native to the tropical rainforests of Central and South America. Toucans are omnivorous and prey on spiders -- including tarantulas -- as well as insects, berries, snakes and small birds. A toucan's bill is nearly as long as the rest of its body. The bill's size enables the bird to attack a tarantula without fear of the spider striking back. Toucans eat spiders similarly to how they eat fruit and berries. Once it has killed the tarantula, a toucan places the spider in its mouth and tilts its head back to swallow the victim.
Western bluebirds, or Sialia mexicana, are native throughout the southwest United States, Mexico and central Mexico. As the name implies, western bluebirds have light blue plumage on their backs, crowns and tails; their chest has a mix of white and red feathers. This bird is omnivorous and dines on tarantulas and other spiders. Other dietary items are insects, fruits and spiders. Western bluebirds are tree-dwellers and look for ground-dwelling prey from above. When western bluebirds see tarantulas, they swoop from their branch quickly and take the tarantula by surprise.