Yes, you can.

But Theymos disabled Animated avatars from getting uploaded after some complaints from members. It's only members who have never changed their animated avatar from the time disabled uploading them who still have them working such as
1. Vod - https://bitcointalk.org/index.php?action=profile;u=30747
2. ibminer - https://bitcointalk.org/index.php?action=profile;u=84866