Although the Thoth are more or less humanoid in appearance, their physiology is remarkably different from that of humans; one example of this would be the fact that their brain in located in the chest, and not the head. The Thoth have feather-like appendages that protect them from the chilly Martian nights very well, but these are retracted and invisible during the day. Different members of this species have different-coloured feathers; Tweel's feathers are orange. The Thoth also have sharp retractable claws, but they are very rarely exposed, and only used for defense. The Thoth have an exceptionally unassuming and friendly nature, but are also formidable opponents when backed into a corner.