I'll give you an example -- if you take a horseshoe crab off the beach, and you fly it all the way across the continent, and you drop it into a sloped cage, it will scramble up the floor of the cage as the tide is rising on its home shores, and it'll skitter down again right as the water is receding thousands of miles away.
Us posaré un exemple. Si traiem un cranc de la platja, el duem a l'altre extrem del continent, i el posem dins una gàbia amb pendent, s'enfilarà a la part alta (del fons) de la gàbia quan pugi la marea a les costes del lloc del qual prové i baixarà novament quan la marea baixi a milers de quilòmetres de distància.