Suck toads have a flat underside and a dome shaped, olive green colored back with brown bumps. They have a small face and six brown legs each with three toes. As opposed to real toads which normally have four legs with four toes on the front legs and five on the hind legs.
Suck toads require a very specific set of conditions in order to thrive, especially when attached to a host, otherwise, they will become sick and turn dark purple. They are mostly situated to habitats that have a calm, natural scenery lacking bright colors and lights and enjoy being around mud to keep them hydrated. Their diet consists of worms as well as green roughage such as kale. Any host that a suck toad attaches to, as one did to Brittany, must avoid eating sugar as the toad can absorb it through the host's skin and be harmed. Removing a suck toad from its host is extremely difficult and requires a specialist.
- The specialist's statement that the suck toad "can do remarkable things for the human race." is a reference to the real world fact that endangered species of amphibians are currently being studied in biomedical research to create new treatments for human diseases.