Monstrous Cohorts in Pathfinder

ulfric1ulfric1
in d20PFSRD
Why do they have such a high effective level when compared to their power/HD? They typically have an effective character level of say, 17, for a HD of 12, and a CR of 10(Couatl). Isn't that drastically underpowered compared to a level 17 Human fighter or wizard?
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