The examples you listed, the giant Sloth, the Mastodon, and the giant Armadillo are all actually smaller than a modern elephant so you're not really making your

The examples you listed, the giant Sloth, the Mastodon, and the giant Armadillo are all actually smaller than a modern elephant so you're not really making your point with those links. The giant sauropods are thought to have been 10 times heavier than an Elephant. Ten times heavier! That's enormous. And the wandering albatross you linked to is said to have existed 50 million years ago in the article.