Cote D'Ivoire Sharks Fish Ocean Fauna Souvenir Sheet Mint NH animal stamps Aerostats gain their lift from

Aerostats gain their lift from large gas bags filled with a lifting gas that is less dense than the surrounding air

An airship or dirigible balloon is a type of aerostat or lighter-than-air aircraft that can navigate through the air under its own power

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Cote D'Ivoire Sharks Fish Ocean Fauna Souvenir Sheet Mint NH animal stamps Aerostats gain their lift fromCote D'Iviore Sharks Fish Ocean Fauna Souvenir Sheet Mint NH Sharks are a group of elasmobranch fish characterized by a cartilaginous skeleton, five to seven gill slits on the sides of the head, and pectoral fins that are not fused to the head. Modern sharks are classified within the clade Selachimorpha (or Selachii) and are the sister group to the rays. However, the term "shark" has also been used for extinct members of the subclass Elasmobranchii