The coincidental conjunction of a friendship-forming instinct, a novel-secret-seeking instinct, _and_ a nearby distinct subspecies with similar properties, led to some unusual behavior patterns. Given the different survival-relevant opportunities in their respective habitats, each subspecies predominantly hoarded _different_ secrets: the secret of how to jump and land on the thinner branches of the reedy pilot tree was of little relevance to the daily activity of a west-valley ground squirrel, but the secret of how to bury nuts without making it obvious that the ground had been upturned was of little import to an east-valley tree squirrel.
But the squirrels' _novelty-seeking instincts_ didn't track such distinctions. Secrets from one subspecies thus functioned as a superstimulus to the other subspecies, on account of being so exotic, thus making "special" cross-subspecies friendships particularly desirable and sought-after.
The coincidental conjunction of a friendship-forming instinct, a novel-secret-seeking instinct, _and_ a nearby distinct subspecies with similar properties, led to some unusual behavior patterns. Given the different survival-relevant opportunities in their respective habitats, each subspecies predominantly hoarded _different_ secrets: the secret of how to jump and land on the thinner branches of the reedy pilot tree was of little relevance to the daily activity of a west-valley ground squirrel, but the secret of how to bury nuts without making it obvious that the ground had been upturned was of little import to an east-valley tree squirrel.
But the squirrels' _novelty-seeking instincts_ didn't track such distinctions. Secrets from one subspecies thus functioned as a superstimulus to the other subspecies, on account of being so exotic, thus making "special" cross-subspecies friendships particularly desirable and sought-after.