The chap who used to take me ferreting when i was a kid caught birds,he had walking sticks that pulled apart ,a bit like sword sticks,when he found were they were feeding he would unsheath the limed rod from the stick and place it in the reeds,never cared for it my self, most of them die anyway.
sad most dies my dad never lost a wild catch. The lime needs of the bird ASAP they try to clean it if themselves that kills them. Not that anyone would use it today but worth knowing