If you encounter a reaper queen she will have 45,000 health and if you come across a reaper king they will have much much lower. For both of them make sure you have a light pet and a decent hp Dino and melee. Surface reapers explain their self but their are many and they overwhelm you so be careful. Happy hunting survivors and don’t forget to be adventurous.
There's a glitch about half way through the baby stage where the baby attacks you regardless of the gland buff this drains it's stamina which will drain it's food to recharge as long as your baby has food in it's inventory it wont starve because of this even if it's food hits zero just feed it like normal and keep a close eye on it