- - Author of "Theory of Evolution", who expressed much aversion towards Mathematics: 2 wds.
- - English naturalist who is best known for his theory of evolution: 2 wds.
- - Author of The Descent of Man
- - Pioneering biologist known for his theory of evolution: 2 wds.
- - Naturalist on HMS Beagle
- - British scientist known for his theory of evolution: 2 wds.
- - Scientist whose theory leads to the wordplay in this puzzle's theme
- - "On the Origin of Species" author
- - He was born on 56-Across
- - Author of "On the Origin of Species"
- - rachel is drawn, strangely, to a naturalist
- - Beagle man
- - Beagle passenger
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