Seeing spiritual causes does not take away a need to respond to physical world. Gemora is full of discussions what does or might happen in various cases and they respect knowledge of agriculture, science, etc. It is not a routine answer in Gemora to say – stop worrying about it, let Hashem take care of it.
Avira, an interesting point re: species. But as we established that R Hirsh is not infallible, we would need a better source. Say Rhinoceri (sp?) are big enough to be seen on satellite imagery. It would not be impossible to search whole earth images for them (if not found – should we presume that they live in someone’s basement?).