Mouse or young Rat?

Mouse or young Rat?

Observation - Mouse or young Rat?. Description: I cant decide if this is a young rat or a mouse. It was seen on sea shore rocks where rats are very common but something tells me this is a mouse? It is quite small, body length approx. 10/11cm. I followed it and it cornered itself under a tussock of gra

I cant decide if this is a young rat or a mouse. It was seen on sea shore rocks where rats are very common but something tells me this is a mouse? It is quite small, body length approx. 10/11cm. I followed it and it cornered itself under a tussock of grass. It gave a few frightened squeaks as I photographed it and then it scampered past me and away into grass.