My chooks have discovered there's a whole world to discover outside their yard, and have worked out a multi-step way to get over the fence. My yard is not really ready for a chook assault, so I've got the choice between extending the fence upwards or clipping their wings (or rather, 'wing'). I've googled a bit to get more info on the latter approach, and have found conflicting info ('cut as much as you can, it'll be fine' VS. 'careful you don't cut too much and have your little bird bleed to death in your arms'). For example, this article suggests being very careful. Opinions? How easy is it to go wrong? Thanks!