Board Thread:Movie discussion/@comment-26728172-20151212170333/@comment-1187034-20151215055524

I think we should just stick with 40ft for now. JPLegacy is run by fans and their size chart is fan made. Fan made size charts shouldn't be used to find an animal's size in the films. I don't know where they found the sizes 42 ft for the females and males being 40 ft. The closest size I could get was from The Making of The Lost World: Jurassic Park book which when describing the size of the Tyrannosaur animatronics mounted on carts used in film, and I quote: "At its full extension on the cart, each T-rex reached a length of about thirty-seven feet and a height of twenty feet." The Making of The Lost World: Jurassic Park, page 47

I'm unsure if these animatronics had tails or not, but that's the closest I can get to a size for the two.