You have no mouth and cannot make verbal noises. However, you can communicate telepathically with any number of creatures you can see (or otherwise know are there). You do not have to share a language with the creatures, but they must be able to understand at least one language. You retain this trait even when in another form (such as a Druid's Wild Shape ability or the Polymorph spell). Though you cannot make true sounds, you can use this feature to cast spells with Verbal components.

You can see in all directions at once, and have advantage on Wisdom (Perception) checks relying on sight.

Your tail is tipped with a sharp, scythe-like blade. It is a natural weapon you are proficient with, dealing 1d6 slashing damage on a hit. You may use either Strength or Dexterity when determining your attack rolls and damage with this weapon. You can attack with your tail as a bonus action.

Andalites, having no mouths, do not require food. However, they feed by running upon grass and absorbing the nutrients. If an Andalite does not have access to some kind of grass to run upon in the day, they take a point of exhaustion at the beginning of the next day.

You have disadvantage on Strength checks. Additionally, because of your hooves, you have extreme difficulty when making a climb that requires feet and hands. Making such a climb costs an extra 4 feet of movement, rather than the normal 1 extra foot.

Your Dexterity increases by 2, and your Intelligence increases by 1. Your Strength is reduced by 2.