The True Winter Survivor | Anna's Hummingbird or Golden-crowned Kinglet?

It's incredible that birds as small as the Golden-crowned kinglet and Anna's hummingbird live in northern locations during winter. Small animals have so much working against them during the cold season and yet somehow these two species make it through, but which one is truly a winter warrior?

Audio:
Golden-crowned Kinglet calls @ :38 seconds - 1:42
Marvin, XC748366. Accessible at www.xeno-canto.org748366.
Golden-crowned Kinglet calls @ 4:19 - 4:56
Paul Marvin, XC699495. Accessible at www.xeno-canto.org699495.
Anna's hummingbird call @ 5:05 - 5:25
Paul Marvin, XC691002. Accessible at www.xeno-canto.org691002
Anna's hummingbird calls @ 8:38 - 8:53
Paul Marvin, XC691002. Accessible at www.xeno-canto.org691002
Golden-crowned kinglet calls at 9:34 -10:04
Paul Marvin, XC699495. Accessible at www.xeno-canto.org699495.
License under Creative Commons Attribution-NonCommercial-ShareAlike 4.0

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