Fun Facts on tropical rain forests. It covers about 7% of Earth's surface. Majority of tropical rain forests are in South America and Brazil. The water they produce is evaporated and used as rain in other places. They are one of the oldest biomes on Earth. About half of all known plant and animal species live in tropical rain forests. Some of the tropical rain forests today, were around when dinosaurs roamed the Earth. Most of the animals that live in this biome live in the trees. The rain forests provide many people with cooking species like vanilla, allspice, and black pepper. Some people choose to go farming in tropical rain forests because of the food and spices. The amount of trees in rain forests is responsible for the majority of the oxygen production that we breathe today. Birds droppings, in the tropical rain forests, usually turn into new plants. Insects make up a majority of living organisms in the rain forest. It has over 2,500 vine species. Has a great variety of animals living there. Giant bamboo can grow up to 9 inches a day. About 2,000 trees are cut down out of rain forests per minute.