Yes, artificial intelligence (AI) can tell a polar bear from a can opener. AI is capable of image recognition and classification tasks. It can be trained on a dataset of images that contain polar bears and can openers, and then it can use this training to identify polar bears and can openers in new images.

To train an AI model for this task, the model would first need to be shown a large number of images of polar bears and can openers, and it would need to be labeled whether each image contains a polar bear or a can opener. Then, the model would use this labeled data to learn the features that distinguish polar bears from can openers.

Once the model has been trained, it can then be used to classify new images. When the model is given a new image, it will use its learned features to determine whether the image contains a polar bear or a can opener.