Platypuses store fat in their broad tails, especially before winter or periods of scarce food. The tail also assists in swimming stability and steering. Fat storage provides a critical energy buffer for times when hunting is difficult. Juveniles rapidly deposit fat in their tails to support growth. Fat-tailed platypuses can survive days without food if necessary. This adaptation is similar to desert animals but unique in semi-aquatic mammals.
It highlights energy management strategies in mammals.
Tail fat storage allows survival during food shortages or cold periods.
Platypus tails serve dual functions: swimming and energy storage.
Smithsonian National Zoo (si.edu)