I normally buy into this sort of logic, but there's a fundamental difference. We experience the world in a way that recognizes beavers' and birds' limits, whereas they do not. We can modify ourselves and our environment in a way and changes our limits. Perhaps if the world is a simulation, then there are hard limits, as we are but bits in a computer so to speak, but even then it's not certain - we could become aware of the world outside the simulation and learn to manipulate it thought I/O mechanisms.