So the lion weighs between 265-395. I nailed that one pretty good.
Bison weighs between 1,000-2,200 pounds for an adult male. Nailed that one pretty good too though to be fair that is a pretty wide range.
Also, nature is kind of my specialty so its not surprising that my guesses would be pretty accurate. I have watched a ton of nature television programming and am also an avid outdoorsman.