For example , the wings have deep wingtip slotting , like New World vultures , to reduce the stalling speed .
The wings have a low aspect ratio and low wing - loading , all to make the oilbird capable of flying at low speeds .
For example , the wings have deep wingtip slotting , like New World vultures , to reduce the stalling speed , and the wings have a low aspect ratio and low wing - loading , all to make the oilbird capable of flying at low speeds .