Thorn forest

A thorn forest is a dense, scrubland with vegetation characteristic of dry subtropical and warm temperate areas with a seasonal rainfall averaging 250 to 500 mm (9.8 to 19.7 in).

Thorn forests cover a large part of southwestern North America and southwestern Africa with smaller areas in Africa, South America, and Australia.

In South America, the thorn forest is sometimes called Caatinga, and consists primarily of small, thorny trees that shed their leaves seasonally. Trees typically do not exceed 10 metres (33 ft) in height, usually averaging between 7 and 8 metres (23 and 26 ft) tall.

Thorn forests blend into savanna woodlands as the rainfall increases and into deserts as the climate becomes drier.[1]