Captchas haven’t been effective at protecting important websites for years, they just keep the script kiddies away who can’t afford the tools.
To be fair, keeping the script kiddies away has some good value. Whether that value outweighs all the wasted time and impact to sight/hearing impaired people is another discussion.
Has been and always will be stegosaurus. How can you not love those bone plates and spiked tail? Dude’s a beast.
That said, ankylosaurus comes in at a close second. It’s armor is pretty boss.