The Large Bird closely resembles the Skyray, but is much less compact. The Large Bird has two very large wings measuring about four times the length of their main body section. A tail even longer than their wings trails behind the Large Bird, ending with a triangular vane. On the underside of the Large Bird's body are two small legs similar to those of the Skyray. The head of the Large Bird is very blunt, and doesn't appear to have a beak.
Most of the Large Bird's body is a greenish white color. There are patches of black on the tips and front edges of their wings, on the tail vane, and one their underside stretching from the head to the base of the tail.
The creature's wings appear to take inspiration from real word sea birds such as albatrosses that spend long periods of time over water, having a very wide wingspan that allows them to glide for extremely long periods of time. The tail gives an appearance reminiscent of the early long-tailed pterosaurs.