Thanks for the advice! Im happy to report that the other problem feeder (dendrelaphis formosus) is now eating. I came back and saw his belly full with a gecko!
Im sorry i forgot to be more specific. The two problem draps are actually juveniles and are way too small to take birds or chicks for that matter as you can see from the picture earlier. So i tried using pinkies and live geckos which they wont take yet. I believe when they get bigger i'll use sparrows (which is as easily available as chicks here) but rite now they just wont take even geckos which is their natural diet. After talking with my other friend, I assume the last problem feeder a dendrelaphis cyanachloris did not feed because i house him with another subspecies of his own. The presence of the other snake could have freaked him out. I've moved him into a seperate enclosure and i have to wait and see if it will still eat. If not, I'll try ur bird scenting on mouse technique. Thanks!

Do let me know if u or ur frenz are in need of any specific South-East Asian snake. I can tell u we can pick mangroves and whip snakes from the road side just like that (Of course im exaggerating but u get my point) Perhaps I can help.

Cheerios!
Below is a picture of my friend's boiga nigriceps (red phase)

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