There is a world somewhere between reality and fiction. Although ignored by many, it is very real and so are those living in it. This forum is about the natural world. Here, wild animals will be heard and respected. The forum offers a glimpse into an unknown world as well as a room with a view on the present and the future. Anyone able to speak on behalf of those living in the emerald forest and the deep blue sea is invited to join.
You're right. The more fat part is probably true, it's a necessity for them. Though, maybe part of the reason is that all the giant Amurs we have on record date post 1940. I think's that the problem. They come from the population of only 20-30. The allegedly 325+ kg were pre-1940 for the most part. Yes, old records can be dubious, but throwing them out isn't the way to go either.
On the same token, maybe captive Bengals don't reach their wild maximum in captivity because the captive starter population was possibly inbred, and also lacked the large tiger genes.