Here are some links on some Dolphin "stuff" ... I find the subject quite fasinating so sorry if anyone is bored by this 
From here http://www.polaris.net/~rblacks/dolphins.htm
.....There was no random or apparent accidental contacts before the dolphin learned how. The same thing happened with three different dolphins. They seemed to anticipate the purpose of the switch. Probably from seeing him push it and connecting the push to the reward. Dr. Lilly had used this same technique on monkeys and made the statement that it usually took a chimp about 100 random tries before he learned to push the button, and then a few more to learn how to push the button.
From here http://www.polaris.net/~rblacks/dolphins.htm
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