While bumblebees are not expanding northward, some are retreating to higher elevations as the temperature warms. This animation shows the range compression for a hypothetical North American species forced to shift its elevation by more than 300 metersa figure consistent with newly observed data. (Animation by Jeremy T. Kerr) (0:12)
/https://public-media.smithsonianmag.com/filer/6a/15/6a1577ab-4f61-40c7-a2c5-1431ffd3032a/julaug18_-_web_cover.jpg)
