You don't need a whole group to choose to switch to agriculture; just one innovator to show that it works better
People who do not use agriculture are typically nomadic -- they don't stay in one single place long enough.
An experiment to try agriculture would involve settling down in one spot -- and if that experiment fails you're in a lot of trouble.
This is entirely true; but in my purely made up example - birds are transportable; they leave fertiliser as they go and probably improve the quality of the soil. Assuming a nomad repeats their path; they will eventually pass across previously visited places with edible plants growing where they have passed.
The model of try new crazy ideas that sound good and see if they fail can probably be compared to modern day "startups" (within reason). Where startups fail etc. Whereas feeding some birds can probably be compared to "minimum viable pro...
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