Interesting Fact: Some Ring-billed Gull nests at study sites in California and Oregon contained pebbles the size and shape of gull eggs. The parents apparently pulled the pebbles into their nests from the surrounding ground, mistaking them for eggs gone astray. ( https://www.allaboutbirds.org/guide/Ring-billed_Gull/lifehistory )
What do you get when you cross a bird and a lawn mower?
Interesting Fact: Many, if not most, Ring-billed Gulls return to breed at the colony where they hatched. Once they have bred, they are likely to return to the same breeding spot each year, often nesting within a few meters of the last year’s nest site. Many individuals return to the same wintering sites each winter too. ( https://www.allaboutbirds.org/guide/Ring-billed_Gull/lifehistory )