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John M. Marzluff: 2 ideas worth knowing

2 ideas from John M. Marzluff, each explained in a minute and credited to the original work. Free on Savvy.

• Crows remembered one 'dangerous' human face for years — and warned their friends

  Researchers at the University of Washington trapped wild crows while wearing a distinctive mask, then walked around campus in that same mask without bothering the birds at all. Cro…

  — John M. Marzluff, Jeff Walls, Heather N. Cornell, John C. Withey, David P. Craig, Lasting Recognition of Threatening People by Wild American Crows

• Crows trapped by a researcher in a mask still scold that exact mask five years later

  Researchers in Seattle trapped and banded crows while wearing a distinctive mask, then released them. Years afterward, crows across the area scolded anyone wearing that same mask, …

  — John M. Marzluff et al., Lasting Recognition of Threatening Human Individuals by Wild American Crows

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