Won’t Live Where It’s Hot

Stresemann’s bush-crows, Soda Plains, Ethiopia (photo by Nik Borrow, Creative Commons license on Flickr)

Seven years ago I wrote about an endangered member of the crow family in Ethiopia whose range is small and shrinking. Similar in size and sociability to our Florida scrub-jay, Stresemann’s bush-crow (Zavattariornis stresemanni or Ethiopian bush-crow) lives in just 6,000 square miles of southern Ethiopia’s Borana rangelands in an area smaller than New Jersey.

Has the bird’s status changed in the last seven years? No, but we know more.

A 2012 study found that his range was limited by daily high temperature. In 2018 a team of scientists investigated further, taking temperatures throughout the region and comparing the bush-crow’s range to two other local species — white-crowned and superb starlings. Their report at the British Ornithological Union blog showed that Stresemann’s bush-crow has a narrow favorite temperature range and is heat intolerant.

The starlings don’t care how hot it gets but the bush-crow won’t live where the maximum daily temperature is over 30 degrees C (86 degrees F). (Graphs embedded below from bou.org)

Figure 3 embedded from BOU.org study in 2018 on Ethiopian bush-crow

This wouldn’t be a problem except that it’s getting hotter.

Find out more about the bush-crow’s dilemma at:

(photo of Stresemann’s bush-crow by Nik Borrow via Flickr Creative Commons license, Figure 3 embedded from BOU.org: High temperatures and hot birds; click on the captions to see the originals)

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