The problem is that you're trying to record relatively quiet sounds that >99% of people would consider undesirable background noise, so many consumer devices will default to filtering out those sounds and do an excellent job. It would be quite easy for Apple to add a "nature sounds" mode to the recording app and work their computational magic in reverse, but I'm not sure that idea would occur to anyone in a design meeting or make it through review.

If you do want to record those kinds of sounds, the term of art is "field recording" and there's tons of good information available on how to do it well.