File:Indian Crow (Corvus splendens) looking at changeable Lizard (Calotes versicolor) in Pondicherry, India.jpg
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editDescriptionIndian Crow (Corvus splendens) looking at changeable Lizard (Calotes versicolor) in Pondicherry, India.jpg |
English: The Indian Crow is the most common bird of south Indian cities such as Pondicherry. On the picture one of these black angel has spotted a changeable Lizard (Calotes versicolor) and seems to be about to make it his breakfast. Both of these vertebrate species present laterally placed eyes. Such morphological specificity often come with an eye use preference for hunting or scanning potential predators in the environment. Visual inputs coming from each eye are asymmetrically processed by the left and right brain. One could hypothesize that our crow shows a left eye preference for prey detection as it seems to look at the pray with its left eye. However, who knows what is the second eye looking at? Maybe, it is the left eye that is driving the gaze orientation in this situation and the left eye is only following the movement. Finally, we could assume that the two eyes are involved in the process and that the orientation of the animal is the result of synthesis of each hemispheric vision. And what if all of this was just a random choice? Only Science can have the answer. Picture taken in St Gilles St, Puducherry, 605002, INDIA.
Français : Le corbeau indien (Corvus splendens) est l'oiseau le plus commun des villes du sud de l'Inde telles que Pondichéry. Sur la photo un de ces anges noirs a repéré un agame arlequin (Calotes versicolor) et semble sur le point d'en faire son petit-déjeuner. Ces deux espèces de vertébrés présentent une vision bilatérale. Une telle spécificité morphologique est souvent associée à une utilisation préférentielle d'un des yeux plutôt que l'autre pour la chasse ou la détection des prédateurs potentiels dans l'environnement. Les stimuli visuels provenant de chaque œil sont ensuite traités asymétriquement par le cerveau gauche et droit. On pourrait émettre l'hypothèse que notre corbeau présente ici une préférence de l'œil gauche pour la détection des proies. Cependant, qui sait ce que regarde le deuxième œil ? Peut-être, est-ce l'œil gauche qui dirige l'orientation du regard dans cette situation, le droit ne faisant que suivre le mouvement. La photo ne le dit pas. Enfin, nous pourrions supposer que les deux yeux sont impliqués l'un comme l'autre dans le mouvement de la tête et que l'orientation de l'animal est le résultat de la synthèse de chaque vision hémisphérique. Et si tout cela était juste un choix aléatoire ? Seule la Science peut avoir la réponse. |
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Source | Own work |
Author | Simon Targowla |
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