Frogs cannot vomit normally, so when they eat something toxic, they perform full gastric eversion, ejecting their entire stomach out of their mouth.
The frog then uses its front feet to wipe and clean the expelled stomach before swallowing it back into its body. This process is similar to turning pockets inside out.
Other animals that cannot vomit include horses, rabbits, and rats. Sharks also use full gastric eversion to avoid poison and escape predators.
Sea cucumbers can expel their intestines as self-defense, which regrow quickly through a process called autotomy.
Source: Fossbytes
