Minecraft wiki entry for Development_versions, associated text: 80% of zombies spawned above ground in desert biomes, and their variants, will be husks.
All spawns where the zombie does not have a view of the sky will be normal zombies or zombie villagers.
Behaves mostly like a regular zombie.
Its ZombieType tag is 6.
Does not burn in sunlight.
Can spawn as a baby or as a chicken jockey.
Applies 7 seconds of hunger when attacking in Easy, 14 in Normal and 21 in Hard difficulty.
Visually 2 pixels taller than zombies, but has the same hitbox.