Which of the following ants is known for nesting outdoors?

The Velvety tree ant is recognized for its behavior of nesting outdoors, particularly in trees and wooden structures. This species prefers to establish its colonies in natural environments, locating nooks and crevices in outdoor settings, which is reflective of its habitat preferences. Such nesting behavior helps the Velvety tree ant thrive in locations where it can access food sources and avoid the high competition faced indoors.

In contrast, the Pharaoh ant, Thief ant, and House ant are generally associated with indoor nesting, often finding favorable conditions within human dwellings. These species have adapted well to living in close proximity to humans, leading them to prefer indoor environments where food and shelter are readily available. Thus, the Velvety tree ant stands out as the species that distinctly prefers outdoor nesting.