Crows have shown that they can solve a puzzle in which they must drop rocks into a container of water so that a piece of food floating on the surface moves into reach. They are very smart birds. They have also shown an ability to remember human’s faces. One study says they are as smart as seven-year-old humans!
カラスは、水が入った器の中に浮いている餌を取り出す為に、石を落として水位を上げる知能があります。とっても頭の良い鳥ですね！人間の顔も覚えられます。人間の７歳児と同じくらいの知能だという調査結果があります！
