What characteristic helps to identify Buteos during flight?

The characteristic that helps to identify Buteos during flight is their robust bodies. Buteos are a group of large-bodied hawks that generally have broad wings and a stocky build. When in flight, their heavy bodies give them a distinctive appearance, especially compared to more slender raptors. This robust physique allows them to soar efficiently and glide on thermals, making them easier to spot in the sky.

In contrast, while long pointed wings might be indicative of other raptors that specialize in faster flight, and longer tails can be features of different species, they do not specifically define Buteos. Likewise, small stature does not apply to Buteos, as they are typically larger than many other hawks. Thus, the robust body structure is a key identifier that sets Buteos apart in the avian world during flight.