Tropical ecology is the relationship between plants and animals in a tropical environment (in a tropical zone), these mean the area between tropic of Cancer and tropic of Capricorn. Day and night last here approximately 12 hours. Characteristic for tropical zone is at least one day of right angle sun shining. High temperatures and numerous of sunny days are also typical for tropical zone. All the best universities do research in tropical ecology, because due to the highest biodiversity among Earth's regions in tropics, the most species interactions and their adaptability. Best known scientific journals include Biotropica, Journal of Tropical Ecology and Ecotropica.