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Frogs belong to the class of amphibians, which evolved from fish around 270 million years ago. Amphibians include frogs, toads, newts, salamanders and caecilians. Frogs are cold-blooded and have soft skin, beginning life as larvae in water before metamorphosing into adults on land. Australia has approximately 219 frog species, over 90% of which are unique to Australia. However, at least 12 Australian frog species have gone extinct in the last 40 years, with 47 more considered threatened.
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Wildlife conservation efforts aim to protect endangered species around the world. In the US, there are nearly 1,000 endangered animal and plant species. Habitat destruction is the primary cause of endangerment, as human activity rapidly destroys habitats. Other threats include invasive species, overexploitation, disease, and pollution. The Endangered Species Act of 1973 and establishment of wildlife refuges help protect species. Specific conservation successes include the recovery of the American bald eagle from pesticide poisoning and international whaling regulations helping whale populations rebound.
TOP 10 RAREST ANIMALS N THE WORLD.docx
The document lists the 10 rarest animal species in the world, which are all critically endangered. These include the vaquita porpoise with a population of only 18; the Javan rhinoceros, with only 18 mature adults remaining; and the Kakapo parrot, whose population was devastated by human activity but is now up to 116 adults due to conservation efforts. Without immediate action, these 10 species are at high risk of extinction.
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The document discusses biodiversity and species conservation. It defines biodiversity and species concepts, outlines threats like habitat loss and overharvesting, and describes approaches to endangered species management including the Endangered Species Act, captive breeding programs, and international wildlife treaties. Key challenges include the high number of unidentified species, accelerating extinction rates, and balancing conservation with economic interests.
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Q&A
- 1. Frogs belong to a class of animals called amphibians. This is a large group worldwide which evolved from a group of fishes around 270 million years ago. Amphibians include frogs, toads, newts, salamanders and caecilians. Frogs are Australia’s only native amphibians. Amphibians are cold-blooded which means they cannot generate their own body heat and rely on external sources in their surroundings for warmth. They also have soft glandular skin, and a lifecycle which usually begins as a larval stage in water before a metamorphosis into an adult living on land. Australia is ranked number 13 in the world for the highest number of frog species with approximately 219 different frog species, 93.5% of these species occur no where else in the world! Although new species are regularly being discovered, in the last 40 years, at least 12 frog species have disappeared from Australia with a further 47 of our remaining species considered threatened. Frogs and other amphibians profoundly enhance our lives and our world in countless ways. In addition to their intrinsic value as a beautiful part of nature, they offer many benefits to us; They play an important role in the food web as both predator and • prey, maintaining the delicate balance of nature. Where they are disappearing, harmful effects are already being documented. • Amphibians eat pest insects, benefiting successful agriculture around the world and minimizing the spread of diseases, including malaria. The skin of amphibians has substances that protect them from • some viruses, offering possible medical cures for a variety of human diseases, including HIV and AIDS. Worksheet created by Alix Ludeke using information retrieved from; www.arf.net.au/frogs/index.html and www.flickr.com/photos/76195812@N00/2438313785