Dreaming about snake?

Hi, I had dream about water snake(dark green colored). The situation is follows. I was looking at some fish, a snake, few crocodile around a shore of pond. The snake was going to eat a bird and after eating, it just jumped becoming bigger and ped by me and again went to water. The size was bigger than previous. Later when I stare at it, it started to come near me and I had to run, it became mive size and started chasing me. I had to run and i swim in water having plants covered by. I went to another side of pond quickly then I realised, its no longer chasing me then I came back to place where I was and can see my sister, mum around. I became more calm.