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Karen Dykes
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2021-12-08
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passed on August 08, 2024 at 14:06
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  • 4. Exposure hazards of trans mountain migration + drought hazard of trans desert movement. Thousands of yellow wagtails + other small species have been seen dead on the Sahara. 5. Traditional routes. The great trans asiatic wheatear route that brings all wheatears to Africa to winter. [David] Lack thinks that the Greenland wheatears flie [fly] nonstop from " to Africa. He uses as evidence the abundant southbound Oceanic records. I don't think this means anything more than a lot of inexperienced young. He points out that northbound these oceanic occurrences are absent. 6. "Explosive migration" used by him to refer to erratic population movements such as the red grouse flying out to sea + perishing in thousands. These seem to have one feature in common with normal migration. The birds become very fat before it happens.
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