Two groups of pigeons were trained with a go/no-go proeedure to diseriminate video Images of eonspecifies based on the individuals or else on their aetions. Both groups showed rapid aequisition, and the diserimination transferred to new seenes in Experiment 1 and to static seenes in Experiment 2, In Experiment 3, experimentally naive pigeons were trained to diseriminate video Images of particular birds showing different aetions. Transfer to novel seenes, including a new bird and a new motion, revealed the dominanee of motion as a eue to diseriminate video Images, In Experiment 4, the pigeons trained to diseriminate video seenes of 2 pigeons showing a variety of activities sueeessfully reeognized these stimuli regardless of whether the video was played forward or baekward, and transferred the diserimination to still seenes. The findings suggest that pigeons' diserimination ofvideo images is primarily based on information that is invariant aeross statie and dynamic eonditions.Individual recognition is of great ecological relevance to animals. It is important for animals to respond differentially and appropriately to their social partners and to other individuals. There is little or no doubt that the ability to recognize individuals is based on perceptual and cognitive factors and on species-typical social interactive behaviors. Still or moving pictures of conspecifics have been used to study cognition and social behaviors in apes