WHO AM I?

I live in the ice and snow. I am short and cute. I can swim but I can't fly. I have a lot of family members. Who am I?

I live in the rain forest. I am very short! I can use camouflage to hide but I can't run fast to escape. Who am I?

I can live in the desert but I can't live in the ocean because I can't swim. I am very big! I have a big nose too! Who am I?

I live in the desert. I have a big back to carry people. I can run fast but I can't fly. Who am I?