I'm sorry if I offend anyone here, but the homeless people this side of the pond can hardly string together a sentence, let alone trap pidgeons.
They are generally so high on drink and drugs they couldn't tell you the time of day.
To class them as some kind of survival experts is taking it a bit far.
I leave for work at 8am - they are sitting on the sidewalk begging for money.
I come back from work at 6pm - they are still on the sidewalk begging for money.
No skill needed there
Martin