Over 30,000 fish species inhabit Earth's oceans and fresh water. Some fish species pose threats to humans or can be poisonous
WEF's Travel & Tourism Competitiveness Report ranks countries based on natural resources. Top 30 countries selected from natural resources section. Traveler editors' personal picks considered bonus entries
Most baby animals are called cubs or calves. Baby animals are often referred to by their adult counterparts. Baby animals are often called hatchlings, not baby crocodiles
Two living species: common ostrich in Africa and Somali ostrich in Horn of Africa. Heaviest and largest living birds, weighing 63.5-145 kilograms. Can run at 70 km/h, fastest birds on land. Used for leather, feathers, eggs, meat, and oil production
Fish evolved from filter feeders 535-0 Ma ago. First jawed fish appeared in Silurian, "Age of Fishes". Bony fish evolved after end-Devonian extinction. Teleosts (96% of fish) are bony fishes with protruding jaws
Elephants are the largest living land animals with three recognized species. They have a prehensile trunk, tusks, large ear flaps, and pillar-like legs. Their brain is the largest of all terrestrial mammals. They evolved from proboscideans during the Miocene period