Andalite

The Andalites are a fictional alien species from the Animorphs series of young adult books. They are characterized by their horse-like appearance, with four legs, a long, slender body, and a prehensile tail. Their heads are elongated, with large, compound eyes on the sides and a mouth underneath. Andalites possess a unique ability known as morphing, which allows them to transform into any living organism they have physically touched. This ability is central to the Animorphs series, as a group of Andalites and human teenagers use morphing to fight an alien invasion.

Andalites are highly intelligent and technologically advanced. They possess a sophisticated understanding of biology and genetics, which enables their morphing ability. Their society is hierarchical, with a ruling class and a warrior caste. Andalites are generally depicted as a noble and honorable species, though individual characters display a range of personalities and motivations. Their homeworld is a lush planet called Andalite, which is a vibrant ecosystem.

In the Animorphs series, a young Andalite named Elfangor crash-lands on Earth and bestows the power of morphing upon five human teenagers. This event thrusts them into a secret war against the Yeerks, an alien parasitic species that infests the brains of sentient beings. The Andalites are the primary antagonists of the Yeerks, dedicating themselves to protecting other species from Yeerk subjugation. Their advanced technology and strategic prowess make them formidable opponents to the Yeerk empire.