The evolution of the amniotic egg -- complete with membrane and shell -- was key to vertebrates leaving the oceans and colonizing the land and air but how bird eggs evolved into so many different shapes and sizes has long been a mystery. Now, an international team of scientists took a quantitative approach to that […]
At least 1.4 million seagulls feed at landfills in North America. Aside from the nuisance they pose, a study finds their nutrient-rich feces may threaten the health of nearby waters. The study estimates North American gulls deposit 240 tons of nitrogen and 39 tons of phosphorus into nearby lakes and reservoirs each year, fertilizing algae […]
It's easy to make up a story to explain an evolved trait; proving that's what happened is much harder. Here scientists test ideas about cooperative breeding in birds and find a solution that resolves earlier disagreements.