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It may be hard to swallow, but Bumpus could get bumped to the back burner

10,000 Birds

This was proposed as an example of what we now call “stabilizing selection” … variation is constantly introduced into populations, but every now and then “selective forces” culls the variation out. Over the course of 30 years, the researchers collected all the road-killed swallows they encountered while doing their other research.

Killing 216
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Hornbills of Sabah

10,000 Birds

Presumably, the species also not only eats fruit but also mammals and possibly birds –the HBW specifically mentions the species catching bats emerging from caves at dusk, and feeding them to juveniles. Unfortunately, the other hornbill species are not nearly as adaptable. The Wreathed Hornbill is also listed as Vulnerable.