They kept these animals in a laboratory for a year, to acclimatise them, and then challenged them with various tasks which, if performed successfully, would yield a reward of food.
Yeah so looks can be deceiving at the moment the water is really really cold although the temperature is quite warm outside So we advise you, before you get in the water, acclimatise.
In some respects it's a testament to how well we've acclimatised to the environment we were born in, but it's a big obstacle if we ever want to live anywhere else.