Fat-tailed

In mammalogy:

• Dwarf Fat-tailed Mouse Opossum, opossum species from South America
• Fat-tailed Dunnart, species of mouse-like marsupial of the Dasyuridae family
• Fat-tailed False Antechinus, member of the Dasyuromorphia order
• Fat-tailed Gerbil, rodent belonging to subfamily Gerbillinae
• Fat-tailed sheep, category of domestic sheep that comprise approximately 25% of world sheep population

In other fields:

• African fat-tailed gecko, nocturnal, ground-dwelling gecko
• Fat tail, phenomenon of approximately normal probability distributions that emerge in practice