Glaucous Gull vs Slaty-backed Gull

The Glaucous Gull and Slaty-backed Gull can be distinguished primarily by their plumage and size. The Glaucous Gull is larger and lacks the dark mantle of the Slaty-backed Gull. Both species have similar habitats but differ in their vocalizations and behavior.

1. Look for the overall size: Glaucous Gulls are larger. 2. Check the mantle color: Glaucous Gulls are pale, while Slaty-backed Gulls have a dark slate-gray mantle. 3. Note the wingtips: Glaucous Gulls lack black wingtips. 4. Listen for calls: Glaucous Gulls have deeper calls. 5. Consider the location: Glaucous Gulls are more Arctic, Slaty-backed Gulls are more Pacific.

The Glaucous Gull is generally larger than the Slaty-backed Gull.

The Glaucous Gull has a pale gray to white plumage with no black on its wings, while the Slaty-backed Gull has a dark slate-gray mantle and black wingtips.

Both species are generalist feeders, but the Glaucous Gull is more likely to be seen scavenging or pirating food from other birds.

Both species can be found in coastal areas, but the Glaucous Gull is more associated with Arctic regions, whereas the Slaty-backed Gull is more common in the North Pacific.

The Glaucous Gull has a deeper and more resonant call compared to the Slaty-backed Gull.