Creeper

Classic
0.24_SURVIVAL_TEST: Added creepers.

0.26: Creeper explosions no longer destroy stone or stone-like blocks.

Explosions leave smoldering.

Creepers no longer produce leaf particles upon explosion.

Alpha
1.2.0: Creepers have a new damage sound.

Beta
1.4: The 'A' in the Minecraft logo now includes a creeper face.

1.5: Creepers become charged when struck by lightning, increasing the explosion's radius and strength.

1.8: Creepers are much more deadly and will definitely kill an unarmored player if in a radius of 4 to 5 blocks around the creeper. This damage is also difficulty-independent.

Sound Update: Creeper explosions have a new sound.