if the double slit particle experiment is observed by an animal and not by any human for eg. chimpanzee, through which slit the particle has passed would it collapse the wave function and form particle pattern. The particle are only observed by the chimapanzee, so it can know which slit the particles passes but the information is unfetchable, similar to an detection with data being erased(delayed choice). To the animal it will see an particle pattern, as it has the information of the particle. Is it that an human who is not looking at the slit and the particle, would see an interference pattern since it has no information of the particle? The animal can also replaced with an human, if it is possible the information he observed is not known. Then would both the observer narrate a different pattern on the screen?