These are the changes of ARK: Survival Evolved’s Patch 201.1, grouped into categories for clarity. If not otherwise indicated, they’re quoted from the relevant Steam Thread.

Creature Changes

• Reduced Gigantopithecus natural aggro range by 20%, and it’ll no longer target wild animals — only nosy humans/tamed animals. Also, its aggro will no longer reset its waking tame. Note that ANY damage resets the progress of a non-violent tame!

Bugfixes

• Fixed SCUBA Goggles scaling/offset not matching heads
• Made multiplayer session list instantly cancel the join if you are not able to join for some reason, rather than making you wait for the time-out.
• Fixed interpolation of character when mounting/dismounting dino

(Original Announcement on Steam)

Here are the patchnotes of the previous patch (201.0)