I've always felt that adaptability was at least as important as intelligence.
For instance, omnivores stand a better chance of surviving than either carnivores or herbivores.

An omnivorous diet played a big role in human development.

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Angel of the Abyss
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"I am Ripper...Tearer...Slasher...Gouger. I am the Teeth in the Darkness, the Talons in the Night. Mine is Strength...and Lust...and Power! I AM BEOWULF!"