The most threatened of major tropical forest types is the tropical dry forest.
According to Holdridge's system of ecological zones, tropical dry forest has a mean annual temperature of 24 degrees C or more and an average annual rainfall of 1,000-2,000 mm.
Large areas of tropical dry forests are found in India, Australia, Central and South America, the Caribbean, Mexico, Africa, and Madagascar. Characterized by species well adapted to drought, trees of dry tropical forests are usually smaller than those in rain forests, and many lose their leaves during the dry season.