They use their elastic stomach and the ability to ingest huge amount of water (and even air when necessary) as a defense mechanism to turn themselves into virtually inedible ball several times their normal size.
A pearl is a hard, glistening object produced within the soft tissue (specifically organs, called the mantle).
It is formed when an object enters the shell of an oyster, In order to protect itself from irritation, the oyster will quickly begin covering the uninvited visitor with layers of nacre, a mineral substance that fashions the mollusks shells.
Layer upon layer of nacre also known as mother-of-pearl, coat the grain of sand until the iridescent gem is formed the mantle) of a living shelled mollusk (oyster).
A natural pearl begins its life intruder, such as a grain inside an oyster’s shell when an of sand or bit of floating food, slips in between one of the two shells of the oyster, a protective layer that covers the mollusk.
The tiger shark (Galeocerdo cuvier)is a species of requiem shark and the only extant member of the genus Galeocerdo. It is a large macropredator, capable of attaining a length over 5m (16 ft 5 in).
Tiger shark teeth are unique with very sharp, pronounced serrations and an unmistakable sideways-pointing tip. Such dentition has developed to slice through flesh, bone, and other tough substances such as turtle.
Image from; Oceana.org
The platypus (Ornithorhynchus anatinus) sometimes referred to as the duck-billed platypus, is a semi-aquatic egg-laying mammal endemic to eastern Australia including Tasmania.
It is the sole living representative of its family (Ornithorhynchidae) and genus (Ornithorhynchus) though a number of related species appear in fossil record.
They can live up to 15 years or more in captivity.