A beak, similar in shape to a parrot's beak, is the only hard part of their bodies.
From the en.wikipedia.org
The parrot's beak and the porcupine's quills may resemble those of the old Pegomastax, but they were in fact tricks evolution had to learn all over again.
From the science.time.com
They then moved each parrot's tongue slowly up and down, and from front to back in its beak.