Wild water buffalo

Where are you getting the information for Wild Water Buffalo at Yala? The only "evidence" I've seen is from Groves who used cranial measurements. Even if there were genuine wild animals at the park once, the sheer number of feral and still-domestic buffaloes there would have swamped them long ago.

As far as I'm aware the only possible true Wild Water Buffalo left in Sri Lanka are in the highlands (where there is a small area free from ferals), but even those are questionable given that there's a very strong possibility that all Water Buffalo on the island are descended from imported domestic stock.

There's plenty of sources mentioning Yala as having populations of wild buffalo, including Yala's offical website Wild Water Buffalo in Yala National Park | Yala & Sri Lanka Wild Water Buffalo | Mammals of Sri Lanka Wild Water Buffalo

But with wild and feral buffalo living amongst eachother there's bound to be some cross-breeding between the two.

Yes, there are a lot of websites saying they are there - but I'm more interested in legitimate reliable sources.