If you enable the display of hitboxes(F3+B) an you look at a Mob with an active "glowing effect" The displayed hitbox will get surrounded with a glowing "border" as well!
MC-83870
Glowing effect affects hitbox as well!
Resolved
Won't Fix
1
Confirmed
Minecraft 15w31a, Minecraft 15w31b, Minecraft 15w36c, Minecraft 15w37a, Minecraft 15w40b, Minecraft 15w41b, Minecraft 15w42a, Minecraft 15w43c, Minecraft 15w44b, Minecraft 15w46a
Retrieved
Confirmed for 15w36c