身近にいる動物から滅多に見ない動物まで その賢さに関するランキングを紹介します。 <br /><br />(For Non-Japanese Viewers) <br />When you watch the video, please click the Gear icon "⚙ "in the top-right corner of the screen to access the subtitle options, then select your language if available. <br /><br />From everyday animals to those you rarely see, here's a ranking of their intelligence.
