This is what I do, and it works a treat
. if you know where the birds like to sit it helps, dress dark and walk lightly and slowly.
don't illuminate the reticule on your scope too high or you wont see frig all through the scope, but if your just using a non illuminated reticule you need to know your aiming at the right spot!
make sure you know your aim points for different ELEVATED ranges. this is important to not be injuring birds, especially at night!
you can get right under them if your quiet enough lol but your back and neck wont thank you the next day if you take too many of these