Tanks when lost

When tanks no longer have durability (HP) they begin to shake while raising their shotgun and then they explode leaving behind gravestones which represent their rank. If the ground where the gravestone is destroyed, it vanishes. This also applies to towers, trees, bushes that have been ran over 3 times. Sheep die if they are near tanks, gravestones or weapon attacks. They get cut and leave behind bones and meat. The tanks on the other hand leave their shotgun, wheels and weapons and disappear after 5 seconds. The gravestone color depends on the level of the tank (starting to with the normal color for the lowest tank level).