In December 1829 she found a fossil fish, Squaloraja, which attracted attention because it had characteristics intermediate between sharks and rays.

The relationship between sharks and Norwalk baffles most adults, though.

Fossil record have revealed predator-prey relationship between large sharks (e.g. C. megalodon) and Cetotheriids.

In the table below, the comparison is made between sharks and bony fishes.

Due to the similarities between the common smooth-hound and other sharks, misidentification occurred for a long time.

The shark is a transitional species, showing intermediate features between present-day great white sharks and smaller, prehistoric mako sharks.

However, it is also possible that transmission of the parasite from shark to shark occurs when sharks congregate and skin-to-skin contacts between sharks are frequent.

A perfect balance between fish and sharks, which increase and decrease but never become extinct.

Whether it is the Commission or the nation states that pretend to control these battles between financial sharks is of no importance from the workers' point of view.

Close encounters between dolphins and predatory sharks often result in evasive responses by the dolphins.