Kaziranga tigers, these days seems to grow to GIGANTIC sizes, just like prehistoric Siberian and Bengal tigers. Some gigantic tigers were revealed in the camera trap pictures, LOT bigger than from other national parks. Any reasons for this?
Yes, there seem to be a lot of reasons.
(1)They have the highest prey density as high as prehistoric tigers had.
(2)They are always busy engaged in territorial disputes with other tigers or they don't seem to be free roaming, unlike tigers from other national parks because the park has some of the highest density of animals in the world. So, they are feeling the ideal and perfect wilderness in their environment which prehistoric tigers used to have. So, they don't seem or they are too busy to bother humans and a little human interference in the core areas of this park does not seem to have ANY effect on their body sizes. So, there is no stress because of human interference that leads to size reduction.
(3) These parks have PLENTIFUL numbers of one horned rhinocerus, water buffaloes and other large animals which even GIGANTIC sized tigers can over run and prey on them. So, they need not run at great speeds and prey essentially on small animals like deer, wild boar, muntaj etc.
(4)These parks have TALL elephant grasses growing to as tall as 12feet. So, they provide PERFECT camauflage and stealth these giant tigers need. They seem to love hiding in these grasses and rarely expose themselves outside these grasses. So, in this way they can even hunt smaller animals with lot of stealth and cunning abilities, no matter what their body sizes are.