MacGillivray correctly distinguished between the Hooded Crow and Carrion Crow, but they were considered separate species for the next one and a half centuries until, in 2002, on DNA evidence, the Hooded Crow was awarded species status.
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His findings were published in his 1833 book The Internal Structure of Fossil Vegetables found in the Carboniferous and Oolitic deposits of Great Britain, illustrated by William MacGillivray.
A documentary on Hynes, entitled Man of a Thousand Songs and directed by William MacGillivray, debuted at the 2010 Toronto International Film Festival.