Ifyouthoughtfishwerecold,wetcreatureswhoforgeteverythinginthreesecondsflat,thinkagain.TestsonfishatOxfordUniversityhaveshownthatdespitetheirtinybrains,theypossesscognitiveabilitiesoutstrippingthoseofsomesmallmammals.Theyarefastlearners,carrymentalmapsaroundintheirheads-andcanretainmemoriesformonths.
如果你以為魚是三秒內就甚麼都忘掉的冷血水中生物，你要再想清楚了。牛津大學對魚進行測試，發現魚雖然腦袋細小，認知能力卻強過部份小型哺乳類動物。牠們學得快，腦裏帶着地圖，而且記憶可以保留許多個月。