Top Ten Weirdest Animals that are Extinct

These are weird, bizarre, and fascinating animals, but unfortunately (or fortunately because some can be deadly and scary to some people), they're extinct. Which one do you think is the weirdest one? Cast your votes and comment! Feel free to add more!
The Top Ten
1 Opabinia
2 Hallucigenia
3 Stethacanthus
4 Helicoprion
5 Longisquama
6 Deinotherium
7 Platybelodon
8 Odobenocetops
9 Nyctosaurus Nyctosaurus is a genus of pterodactyloid pterosaur, the remains of which have been found in the Niobrara Formation of the mid-western United States, which, during the late Cretaceous Period, was covered in an extensive shallow sea.

Name means "night lizard or bat lizard". It has a antlered crest and lived near the coast.

10 Therizinosaurus Therizinosaurus is a genus of very large therizinosaurid that lived in Asia during the Late Cretaceous period in what is now the Nemegt Formation around 70 million years ago.
The Contenders
11 Anomalocaris

I did a school project on them once.

12 Nigersaurus
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