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Not more romanticising and selective anthropomorphising from the dolphin fanboys.
Animal intelligence is difficult to discern due to the fact that we can't communicate with them, so it's rather difficult in most cases to know whether an animal's behaviour is due to a process of conscious intelligence or whether it's down to some kind of automatic response, or a behaviour which was picked up and adopted by chance.
This little trick with the shell is quite nifty, but certainly unremarkable in the animal world. It doesn't really say too much about intelligence or lack of it.
Also, for all the dolphin-worshippers who, because of apparent misanthropy, take an escapist route of idolising a fantasy view of another species - they aren't as cuddly as you'd like to think they are. As with most other species' who have survived for so long, they possess a number of unpleasant traits and behaviours.
Male dolphins have been known to chase a female for hours, until she runs out of energy, and then they proceed to gang-rape her. Juvenile dolphins have been observed bashing the porpoises to death on rocks - not for food, but apparently just for the fun of it.