I first noticed this when I recently played Superflat Creative first time ever, when I saw a few Zombies drop from above (maybe other mobs as well, not sure about this), but that was in darkness and rain, and I presumed it might have to do with the Superflat world being close to rock bottom.
However, since then I've thrice witnessed single Zombies dropping out of the clear blue sky - literally - in Survival as well (Large Biomes world). The last instance appearently correlated with me finishing off a Zombie Pigman that had ventured into the Overworld; the earlier two might have happened in similar circumstances, at least I recall fighting mobs at the respective times.
What's going on here? Is Herobrine employing paratrooper mercs now?
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Duplicate of MC-14683, please use the search function to see if your bug has already been submitted. Currently over 55% of tickets are being closed as duplicate.
The new feature in 13w17a is that if zombies are hurt they "call" others to their aid. The zombies are getting hurt by the daylight, so they call upon more.