When culling chicks, I use a sharp pair of pruning sheers. I put the baby in a paper bag first and do the deed inside the bag so I don't have to see it. Burn or bury the bag and all when finished. On adult birds, I use the broomstick method since I'm not confident enough to use a hatchet to behead them. You place the bird on a flat surface on its chest. Place the broomstick over the back of the neck, then stand on the broom with one foot on either side of their head. Then simply pull up on the feet hard and fast. The broomstick method works with chicks too, but they're alot more delicate and their heads will pop off if you pull to hard. I don't particularly like either method, but when an animal is suffering both methods are fast and humane. Good luck!