The report noted an overall average increase of 1.5C. While the wren is aided against cold snaps by bird feeders, the climate trend, at least in Canada, is in its favor. The same account notes that “severe winters have apparently been infrequent enough during the 20 th century to allow populations to expand and move northward.” Indeed, one of the key conclusions of an analysis of climate change in southern Ontario was that there has been “ a decrease in the frequency of cold temperature extremes”. The species is known for “decimation… by severe winter conditions” (BNA) at the northern limits of its range. The cold waves marked on the graph were particularly record-breaking and long-lasting. Over 95% of these come from southern Ontario. The raw number of Carolina Wrens reported on Christmas Bird Counts in Canada. I’ve seen photos of their nests in old cans, boots. These wrens are also known for making nests in odd places. The males are exceptionally vocal, making a teakettle-teakettle-teakettle call. What makes the recent Carolina Wren data so interesting is that we can clearly see, in its expansion into Canada, its battle with winter weather conditions. One Carolina Wren wasn’t enough These cute birds can make quite a racket at times. The Carolina Wren has been expanding north since the 1800s due to habitat recovery after deforestation (Haggerty and Morton, 2020 – the Birds of North America (BNA) species account). Anna’s Hummingbird, Turkey Vulture, Red-shouldered Hawk, Great Egret, California Scrub-Jay, Black Phoebe, Townsend’s Warbler, and others). The same thing is happening in the West (e.g. This phenomenon is most obvious – and even dramatic – among non-migratory species and short-distance migrants. And, like many of those species, this expansion started decades ago, before any measurable climate change, but has exploded in the past decades with climate change. Like so many species, the Carolina Wren is expanding northward.
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