Eli5: why are some prehistoric reptiles not dinosaurs?

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I’ve gone my entire life being told “that’s not a dinosaur that’s a (insert what it is) but why? What’s makes one giant lizard a Dinosaur but a different giant reptile not a dinosaur?

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33 Answers

Anonymous 0 Comments

It’s more “ELI9-12”, but if you want to take an accessible and comprehensive deep dive into the evolutionary paths of prehistoric animals, I highly recommend “Dinosaur Empire!” by Abby Howard. It’s the first comic book in a series all about the concepts of the evolutionary tree, it’s amazingly detailed and very fun.

Anonymous 0 Comments

This is the most fun I’ve had randomly learning stuff about dinosaurs since the last time I randomly learned stuff about dinosaurs. How am I many decades into my life and I still love randomly learning stuff about dinosaurs?

Anonymous 0 Comments

This is the most fun I’ve had randomly learning stuff about dinosaurs since the last time I randomly learned stuff about dinosaurs. How am I many decades into my life and I still love randomly learning stuff about dinosaurs?

Anonymous 0 Comments

This is the most fun I’ve had randomly learning stuff about dinosaurs since the last time I randomly learned stuff about dinosaurs. How am I many decades into my life and I still love randomly learning stuff about dinosaurs?

Anonymous 0 Comments

What made a reptile a dinosaur specifically was the special hips; their legs went straight down underneath them like a horse or dog or, ahem, ***bird***, not out to the side like an alligator or iguana or ***any*** modem reptile.

All those gigantic ancient reptiles that you’re told aren’t technically dinosaurs? I’ll bet they’ve got their legs sticking straight out the side like an alligator.

Anonymous 0 Comments

I may be way over simplifying it but the way I explain to high schoolers how all dinos are reptiles but all reptiles aren’t dinos is: dinos are terrestrial, have legs under their bodies not sprawled out from the sides, & laid hard shelled eggs in nests. These 3 characteristics exclude all the groups I used to think were dinosaurs when I was a kid!

Anonymous 0 Comments

What made a reptile a dinosaur specifically was the special hips; their legs went straight down underneath them like a horse or dog or, ahem, ***bird***, not out to the side like an alligator or iguana or ***any*** modem reptile.

All those gigantic ancient reptiles that you’re told aren’t technically dinosaurs? I’ll bet they’ve got their legs sticking straight out the side like an alligator.

Anonymous 0 Comments

I may be way over simplifying it but the way I explain to high schoolers how all dinos are reptiles but all reptiles aren’t dinos is: dinos are terrestrial, have legs under their bodies not sprawled out from the sides, & laid hard shelled eggs in nests. These 3 characteristics exclude all the groups I used to think were dinosaurs when I was a kid!

Anonymous 0 Comments

What made a reptile a dinosaur specifically was the special hips; their legs went straight down underneath them like a horse or dog or, ahem, ***bird***, not out to the side like an alligator or iguana or ***any*** modem reptile.

All those gigantic ancient reptiles that you’re told aren’t technically dinosaurs? I’ll bet they’ve got their legs sticking straight out the side like an alligator.

Anonymous 0 Comments

I may be way over simplifying it but the way I explain to high schoolers how all dinos are reptiles but all reptiles aren’t dinos is: dinos are terrestrial, have legs under their bodies not sprawled out from the sides, & laid hard shelled eggs in nests. These 3 characteristics exclude all the groups I used to think were dinosaurs when I was a kid!