Ironbound Proto-Drake

His skin more hard than brass was found, that sword nor spear could pierce nor wound.

Riding Requirements:

This mount is available to all eligible characters on your account.
Level 10
Apprentice Riding (ground)
Expert Riding (flying)

Source:

Achievement: Glory of the Ulduar Raider

Notes:

This proto-drake was originally the reward for the 25-player Ulduar meta-achievement, and the Rusted Proto-Drake was for the 10-player. The achievements have now merged and both mounts are awarded for the one achievement.

Introduced in:

Patch 3.1

Travel Mode:

Ground (+60% or +100% speed)
Flying (+150%, +280% or +310% speed)

Speed depends on your riding skill.

Matching Companion Pets:

Ironbound Proto-Whelp

Other Mounts Using the Same Model:

Rusted Proto-Drake

More info on Wowhead:

Ironbound Proto-Drake taught by Reins of the Ironbound Proto-Drake