I have been playing the windows 10 version of Minecraft for about 6 months now and have yet to have any mob head drop after they have been killed. This is true for hostile and passive mobs. True for naturally spawning mobs (which is another issue of mine) and from spwaners. I only play difficult in Survival. My sword is enchanted to looting 3 and still no head drops.
Although I am new to Minecraft I feel as though within a 6 month period of time I would have had at least one head drop. I'm trying to make a beacon but am unable to because of this issue.
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Only wither skeletons drop their heads

Thank you for your report!
However, this issue is Invalid.
Mob heads don't drop for all mobs. Maybe you have seen some youtubers that have a custom mod enabled. But this is not the case for vanilla gameplay. If you have a suggestion please post it on the feedback site.
I suggest having a look at the wiki article: https://minecraft.gamepedia.com/Mob_head. Also have a look at our issue guidelines (link below).
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Only wither skeletons drop their heads