Does anyone know what this is?

Does anyone know what this is?

Observation - Does anyone know what this is? - UK and Ireland. Description: I found this in my horses field, It was in a state of decomposition. It was about 50cm long and had long back legs. I am just trying to get the other picture we took onto my computer it shows its whole body.

I found this in my horses field, It was in a state of decomposition. It was about 50cm long and had long back legs. I am just trying to get the other picture we took onto my computer it shows its whole body.