As a begginer, I kill these things very easily by gathering as many arrow a possible, climbing a tall rock and lure the demon chicken near the rock where he can't reach me and just shoot arrows at it until it's dead ¯\_(ツ)_/¯ it actually works.

Also if I run out of arrows I try to find the ✨perfect✨ moment to junp and run for my life ✌️