Ages 5+

Chomping Mechanical Dinosaur Costume


Get your rawr on — with a big green mechanical dinosaur costume, you build yourself! This costume crate contains everything you need to craft a spiky T. rex head, engineer a fierce felt jaw that snaps shut with the pull of a string, then add a set of matching dino claws to complete the look. Finish off your dino discovery by learning about hinges, rotary motion, and fossil detective work. Ready to dig in?

Why it’s awesome

  1. Jaw-dropping science

    Build your own hinged dino jaw that snaps shut with rotary motion.

  2. Dino-mite design

    Stomp and roar your way through trick-or-treating and outdoor imaginative play.

What’s included?

  • felt head

  • felt nose

  • felt jaw

  • 4 felt teeth

  • 3 felt spikes

  • 2 felt eyebrows

  • 6 felt claws

  • 2 wiggle eyes

  • 35 brads

  • 2 bolts

  • 4 nuts

  • 2 cords

  • sticky felt

  • illustrated instruction booklet

Topics explored

  1. Hinges + motors

  2. Felt crafts

  3. Paleontology

Additional details

From the desk of the product designer:

Behind the design

No dinosaur costume is complete without snapping jaws! Explore mechanics to bring this T. rex to life.

- KiwiCo Product Designer

By the numbers


Number of brads used for the costume


Jaw pulley prototypes


Hours worn around the office



32 reviews

Customer images



    Got it for my 3 year old son he loved to build it and play. I would say I had to use fabric glue for the teeth. But we made a great coustum



    This one was AMAZING!! So much fun to build and play with!



    My 4-year-old grandson loved it! He immediately started to make it, with the help of his Dad. They love to do that. They made it in time for him to wear at his birthday party! He's very good at putting things together.



    It is an adorable mask. The chomping mouth was a little difficult to work. It was hard to adjust the screws to get it to chomp like in the video. In the end, it was OK because he just left it open.



    It was a fun project and looks cool! The mouth doesn’t drop open easily tho so can’t really chomp as easily as you’d like.

    Cynthia K


    The chomping jaw is very fun, & my grandson LOVED the process of making it & is excited about the finished product!

Your cart is empty

Shop in the KiwiCo Store ➜
Check out ➜