Somehow I missed this! They came from National Zoo and Aquarium: Lions arrive in Northern Tas | Photos, Video
I see the Lions appear to have lost their manes, meaning they've been castrated - I don't remember them like this last Xmas when we visited the National Zoo, so I wonder why they've done this to them, rather than just vasectomising them, which would allow them to keep their manes. These 4 would be brothers to the 2 white lions at Mansfield Zoo I believe, all 6 were born in the one litter at Mogo zoo - could someone confirm this?