Andalites

Andalites are a fictional alien species from the Animorphs series of young adult books. They are characterized by their deer-like appearance, with four legs, a long neck, and a long, prehensile tail. They possess a single large eye on a stalk that can rotate independently, and two smaller eyes on the sides of their heads. Andalites also have a horn-like proboscis, which they use for communication and defense. Their skin is typically blue or green.

Andalites are a highly advanced and technologically sophisticated species. They possess the ability of morphing, which allows them to transform into any living creature they have physically touched. This ability is central to the plot of the Animorphs series, as it is used by the human protagonists to fight an alien invasion. Andalites are known for their strong moral code and their dedication to justice.

In the Animorphs universe, Andalites are engaged in a secret war against the Yeerks, a parasitic alien race that seeks to control sentient beings. The Andalites discovered the Yeerk threat and, unable to fight them directly in large numbers without revealing themselves to the galaxy, they enlist the help of a small group of human teenagers, bestowing upon them the power of morphing. The Andalites serve as mentors and allies to the human protagonists throughout the series.