When I said science has reached it's limit on what can be measured I am speaking of the phenomenon of not being able to observe or measure a quantum event without affecting the data by making the measurement. It is not possible to take ourselves out of the equation.
And although humans are quite clever apes we still do not know what lurks within the depths of our own seas, let alone beyond our own galaxy. Abiogenisis still confounds us, cold fusion, quantum gravity, Pre Plankian time, conciousness. VCR recording directions..... So asking questions like do animals have a soul can just be added to the list.