動物園で飼育されている3頭のコツメカワウソ(Aonyxcinerea)の移動軌跡をもとに，3匹の行動の影 響関係を検討した.展示スペースにいるカワウソを天井から撮影し，Mask R-CNN によりカワウソの位置を特定し た.さらに，correlated random walk (CRW)モデルにより 3 頭のコツメカワウソの 7 分間の移動軌跡を推定した.カ ワウソの速度の相互影響関係を直交化インパルス応答により検討した.その結果，カワウソ間の社会的な順位が移 動の影響関係と関連していることが示唆された.
（英）
We investigated the mutual influences among the movements of three Asian small-clawed otters (Aonyx cinerea) in the zoo. The otters’ movements in the exhibition area were recorded using a video camera on the ceiling, and the location of the otters was specified by using Mask R-CNN for each frame. Furthermore, each seven-minute trajectory of the otters was estimated using a correlated random walk (CRW) model. The mutual effects of the velocities of the otters’ movements were examined with a Granger test and orthogonalized impulse responses. The results suggest that the causal relationships of the otters’ movements are linked to the social order among them.