While picturing a certain kind of animal in your mind, you cry out in imitation of its most common call. Immediately thereafter, you perceive your surroundings as the animal you imagined would.
Upon casting the spell, you gain the senses of animal creatures. You gain low-light vision and either blindsense out to 30 feet or scent (your choice). You also gain a +2 bonus on Listen and Spot checks.
Source: Spell Compendium, page 79. Originally published in Complete Adventurer, page 147.