Extinct animals size

[Catherine]

From where I was standing the mastodon and the mammoth both looked enormous. If I got another chance to see them I would observe more. On that trip I let myself feel the presence of the creatures and experience their size. I wasn't expecting to see the skeletons either. I was on a different trip with friends and I took a side trip by myself to see the tar pits and the museum. It was worth the whole trip just to see the mammoth and the mastodon.

The Liopleurodon was a serious looking predator. It must have been able to swallow a fairly large prey animal. The oceans were a dangerous place in prehistoric times.

I have heard of the thresher shark. Is there a smaller version that is alive today or are they all extinct.