Nature recording is a really tricky place to start with cheap gear, as ambiences tend to be reasonably quiet and cheap gear nearly always has a high noise floor! I've found most quiet nature ambiences I've recorded with a handheld recorder either with the built in mics or external mics are almost unusable because of the noisefloor.
One response is to get ...
I know this is almost 5 years old... However, I stumbled upon something that supports EMV's answer.
RØDE made a hot lap recording of a GTR and also showed a setup for consumers without a massive budget.
Setup with iPhones and SmartLav+:
Pro setup hot lap: