Animals

Animals

Basic facts:

– the word “animal” comes from the Latin word animalis, meaning “having breath”
– most animals are motile, meaning they can move spontaneously and independently. All animals are also heterotrophs, meaning they must ingest other organisms or their products for sustenance
– animals: estimated 3-30 million species
Invertebrates: 97% of all known species
– sponges: 10,000 species
– cnidarians: 8,000-9,000 species
– molluscs: 100,000 species
– platyhelminths: 13,000 species
– nematodes: 20,000+ species
– annelida: 12,000 species
– arthropods
– crustaceans: 40,000 species
– insects: 1-30 million+ species
– arachnids: 75,500 species

Vertebrates:  3% of all known species
– teptiles: 7,984 species
– amphibians: 5,400 species
– birds: 9,000-10,000 species
– mammals: 4,475-5,000 species
– ray-Finned Fishes: 23,500 species

Ten most endangered species on world:

– black rhino
– giant panda
– tiger
– beluga sturgeon
– goldenseal
– alligator snapping turtle
– hawksbill turtle
– big leaf mahogany
– green-cheeked parrot
– nako Shark

The most biggest animals:

– blue whale
– african elephant
– brown bear
– saltwater crocodile
– giraffe
– ostrich
– chinese giant salamander
– whale shark
– colossal squid
– goliath beetle

Elephant