Admittedly, I'm no ornithologist, but I get the feeling these two birds might be related.
The one on the left is the de facto symbol for Them Crooked Vultures, as shown at the Dave Grohl-Josh Homme-John Paul Jones supergroup's presumably official Web site, www.ThemCrookedVultures.com.
And on the right is the cover of John Paul Jones's second solo album in the last 10 years, The Thunderthief. The bird shown there was designed by Peter Blegvad. Click here for my review of that album, released in the United States and Europe in February 2002.
Incidentally, Jones credited Blegvad, who also contributed lyrics to two songs on that album, as influencing him to try writing his own lyrics for a few other songs on the disc. See this mentioned in part 20 of the transcript of my interview with Jones in December 2001.