Forum:I found anything

I found this, can anyone tell me what is it. I try found at wiki but cant found it. When i want destroy it or hit it somehow it hurt me. I cant upload image before when i use printscreen and input in painting(drawing) there is only white screen. I found it in dirt-stone bagground its that under dirt backgrond in normal biom. It look like zegling nest XD. if anyone know what is it pls tell me.