Vindictive elephant

Is it true that elephants have a good memory?
 
According to the observer for the elephants in London Zoo - it is, because compared to other animals, elephants have large brains - though smaller than the human brain. "They have a good memory," says an observer. "If you teach an elephant to do something, he can do it in a few years. There were even cases where the elephants "repaid" good or evil through almost 30 years. For example, in India, if the mahout mistreats an elephant, he will attack it and remember it years later, as soon as the opportunity presents itself. " The expression "elephants never forget" actually came from the writer Saki. In his book, "Reginald and pursuing sins," published in 1910, he writes, "Women and elephants never forget the injuries."