" Ma was isolated and alone. Under those circumstances people behave differently.
Kya made a soft groan. “Please don't talk to me about isolation. No one has to tell me how it changes a person. I have lived it. I am isolation," Kya whispered with a slight edge. "I forgive Ma for leaving. But I don't understand why she didn't come back- why she abandoned me. You probably don't remember, but after she walked away, you told me that a she-fox will sometimes leave her kits if she's starving or under some other extreme stress. The kits die- as they probably would have anyway- but the vixen lives to breed again when conditions are better, when she can raise a new litter to maturity.
"I've read a lot about this since. In nature- out yonder where the crawdads sing- these ruthless-seeming behaviors actually increase the mother's number of young over her lifetime, and thus her genes for abandoning offspring in times of stress are passed on to the next generation. And on and on. It happens in humans, too. Some behaviors that seem harsh to us now ensured the survival of early man in whatever swamp he was in at the time. Without them, we wouldn't be here. We still store those instincts in our genes, and they express themselves when certain circumstances prevail. Some parts of us will always be what we were, what we had to be to survive- way back yonder. "

― Delia Owens , Where the Crawdads Sing