How to catch Rock Pool crabs - Kids Rock pooling for Crabs

We tried out rocking down in Taranaki NZ when we were visiting our Marae. We had a great time chasing crabs and getting wet, come along and see how we went. We came across two types of crab, WE THINK they are Red Rock Crabs and one we had never seen before that we think is an Iron Crab. Let us know if you know what they are...
Cheers Joel & Nate.