Occasionally on the news I read about young children dying in hot cars on a sunny day. Usually the article reports that the parent(s) 'forgot' about their children still being in the car.
Obviously natural selection would select against a trait where parents forget about their dependent offspring or their whereabouts. However, I can imagine that under certain circumstances and on the fringe of the bell curve for offspring-caretaking, this occasionally happens.
Are there documented examples of animal species (preferably mammals or birds) who truly sometimes 'forget' about taking care for their dependent offspring, or forget their whereabouts?
Disclaimer: I'm aware of possible anthropomorphism in this question. With 'forgetting' I don't mean behavior such as abandoning offspring at the age where they need to become independent, or accidentally being separated from their young.
Here's an example of what I would file under forgetting:
A parent feeds their young every two to three hours. One day, they go out to find food, but get distracted by something interesting (let's say a mate). They spend a day frolicking around with the mate, and eventually return to their young. On return, they find out one of the young has died due to starvation, and they are visibly surprised / startled / upset about this.
To respond to Tyersome's comment: I have done plenty of searching and research. I haven't been able to find anything, neither in the scientific literature nor pop-culture websites / books. When you Google 'animal parenting' you'll find plenty of examples of various species who abandon their young (such as harp seals or rabbits) or who don't care for their own young (such as cuckoos), but these are 'deliberate' actions across an entire species, not examples of accidentally forgetting.