Llamas often spawn in blocks during world generation in mountainous regions and die

Llamas will spawn in mountainous regions onto a block next to a wall, and since the llama hitbox is more than one wide, they start to take damage and die.

In 16w50a they still spawn with their collision box intersecting with the collision box of a block and in some situations might take damage.

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/tp -193 70 176 -165 37

You might have to create a world with this seed multiple times to see the bug happening.