It’s been a long time coming, but there was one identifiable point in my life when I realized I was no longer a Serious Birder. That was two years ago, when Gulls of the Americas, a Peterson Reference ...

The diets of two potential competitor species, Audouin's Larus audouinii and yellow-legged gulls Larus cachinnans, were examined while they bred at the Chafarinas Islands during 1993, 1994, and 1995.

Eggs vibrate in response to parental alarm calls, then pass on the warning to nearby eggs. Yellow-legged gull chicks are vulnerable to carnivores such as minks.Credit...Jose C. Noguera Supported by By ...