What did this reptile used to be?

 What did this reptile used to be?

Observation - What did this reptile used to be?. Description: I found this on a coastal grassland. It head is about 2cm long and about 1cm wide. I only found part of the animal so I don't know how long it was but the piece I found is 12cm long. Any idea what it used to be?

I found this on a coastal grassland. It head is about 2cm long and about 1cm wide. I only found part of the animal so I don't know how long it was but the piece I found is 12cm long. Any idea what it used to be?