Many of them are being studied and introduced into our culture.
Are you an online shopper researching reptiles for sale? When cared for properly, all live as long or longer than mammalian pets of similar size.
Even though they are not considered to be sympathetic as pets, they are very necessary for our ecosystem like any other animals.
Most get dumped on rescue organizations or animal shelters or are left to languish in substandard conditions.
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It may be the smallest continent, but Australia is also the sixth largest country, and has plenty of different habitats to support a wide range of reptilian life.