There is evidence that bumblebees, a wild pollinator of crops and wildflowers, “are getting squeezed by our planet’s changing climate,” says the NPR blog The Salt. The evidence is derived from comparisons of sightings of bumblebees today and records of sightings a century ago. Biologist Jeremy Kerr of the University of Ottawa says some species of the wild bees have disappeared from the warmest and most southern areas they inhabited in the past. Kerr says there’s no evidence that the shift in geographical range was the result of land-clearing or insecticides. While the bees disappeared from warmer areas, the northern end of their range seems static. One researcher said the bees like grasslands and are averse to wooded northern lands.