gaivota-de-bico-riscado vs cagarra-grande

The Ring-billed Gull and Cory's Shearwater are easily distinguished by their habitat and flight patterns. The Ring-billed Gull is typically found near inland water bodies, while Cory's Shearwater is a pelagic species, often seen over open ocean. Their flight styles also differ, with the gull having a more buoyant flight compared to the shearwater's gliding on stiff wings.

Look for the black ring on the bill of the Ring-billed Gull. Observe the habitat: if you're inland or near freshwater, it's likely a Ring-billed Gull; over the ocean, it's likely Cory's Shearwater. Note the flight pattern: buoyant and flapping for the gull, gliding for the shearwater.

Cory's Shearwater is generally larger than the Ring-billed Gull.

Ring-billed Gull has a distinct black ring around its bill, which is absent in Cory's Shearwater. Cory's Shearwater displays a more uniform brownish-grey upperpart compared to the gull's grey back and white underparts.

Ring-billed Gulls are often seen foraging around human activity and inland waters, while Cory's Shearwaters are known for their long-distance oceanic flights and gliding behavior.

Ring-billed Gulls are found near lakes, rivers, and coastal areas, whereas Cory's Shearwaters are strictly oceanic, rarely coming close to shore except during breeding.