Yes, we're headed there tomorrow and yes, all the parks have lockers. There are 2 sizes also. The first is smallish at 11H X 9W X 16D at $7 per day plus $5 deposit. The larger lockers are 17.5H X 12W X 16D at $9 per day plus deposit. We will be keeping our lunch cooler there.
Oops, forgot you needed this part: Lockers can be found at two locations at Animal Kingdom. The Expedition Storage Lockers are near Guest Relations inside the park. The outside lockers are near the Kennel.
Thank you yes I will be coming very light, but one time several years ago I went on the Hershey Park rapids ride and got drenched with no change of clothes, if my son wants to go on Kali River I was thinking to bring a change of clothes that day and when I was looking at the disney website and guidebooks there was no mention of lockers at Animal Kingdom, Thanks!