The rocks that make up Onlu's wings are light and hollow, allowing it to maintain flight for a short period of time. It nests high up in the mountains, collecting small rocks to build its nest.
It burrows its way up to the top of high outcroppings, hoping to befriend potential Trainers by flying down and sitting on their head. Due to its massive weight, however, Onlu tends to come in for a landing rather faster than it intends to.
