Upright posture

The different orientation of the neuraxis between an upright biped (human) and a quadruped (dog)
The seemingly upright bipedalism of a common ostrich (Struthio camelus) is in fact not a true upright posture

An upright posture or erect posture is the state of an animal's body where its craniocaudal axis is perpendicular (vertical) to the ground and to the direction it is facing/moving. Examples of such postures include some tetrapods with bipedal gait and the swimming posture of seahorses.

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