It seems plausible that there are other reasons it could be digging besides having a gene for digging. It's no different than being a creationist. Lawrence was promoting eugenics, trying to stop the breeding of inferior peoples in his scientific works. More with Mark after the break.
How do animals know how to do things like spin a web or build a dam? A neuroscientist argues it's not “instinct.” Something bigger is going on.
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