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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. There may be more birds and mammals per square kilometer in South Africa. As you know, a lot of birds are killed in the U.S.

Killing 218
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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.