The darker the color, the more favorable the climate conditions are for survival. The outlined areas represent approximate current range for each season. More on reading these maps.
This marsh-nesting, pintsized Eurasian gull “invaded” North America in the mid-20th century, and it was thought at the time that the species would increase and expand in the decades ahead. That outcome has not come to pass, however, as the Little Gull remains uncommon at best in the New World. The model, focusing only on winter, forecasts a nearly 300 percent increase in climatically suitable areas for this diminutive gull—especially in the Great Lakes and Canada’s maritime provinces. If additional breeding colonies establish in this continent (perhaps in marshes in the northern Great Plains), there may be abundant suitable wintering habitat for these colonies’ recruits.
Are the projected range maps different from the range maps in field guides? Find the answer here.