Dozer - Minecraft Creature

An idea I had for a mob after discovering Ocean Temples and Guardians. 

The Dozer would be around 6 blocks tall. It is a passive mob and can't hurt the player directly. However, the Dozer makes tunnels through the earth between layers 20 and 40 and and tends to avoid sources of light, and due to this will turn the opposite direction should it reach a ravine exposed to sunlight. Its skin is impenetrable even by the mightiest of weapons. The only way to kill a Dozer is to place TNT in front of it and explode it. Though this sounds difficult, the Dozer moves very slowly and will not know to avoid the TNT. Silverfish are said to follow close behind them.

Dozers are a very rare species and tend to avoid each other. No one has ever seen a juvenile.