Editing Tropical rainforest (section)

=== Canopy layer ===
{{Main|Canopy (ecology)}}
The canopy is the primary layer of the forest, forming a roof over the two remaining layers. It contains the majority of the largest trees, typically 30–45 m in height. Tall, broad-leaved [[evergreen trees]] are the dominant plants. The densest areas of [[biodiversity]] are found in the forest canopy, as it often supports a rich flora of [[epiphytes]], including orchids, bromeliads, mosses and lichens. These epiphytic plants attach to trunks and branches and obtain water and minerals from rain and debris that collects on the supporting plants. The fauna is similar to that found in the emergent layer, but more diverse. It is suggested that the total arthropod species richness of the tropical canopy might be as high as 20 million.<ref name=Erwin/> Other species inhabiting this layer include many avian species such as the [[yellow-casqued wattled hornbill]] (''Ceratogymna elata''), [[collared sunbird]] (''Anthreptes collaris''), [[grey parrot]] (''Psitacus erithacus''), [[keel-billed toucan]] (''Ramphastos sulfuratus''), [[scarlet macaw]] (''Ara macao'') as well as other animals like the [[spider monkey]] (''Ateles'' sp.), African giant swallowtail (''[[Papilio antimachus]]''), [[three-toed sloth]] (''Bradypus tridactylus''), [[kinkajou]] (''Potos flavus''), and [[tamandua]] (''Tamandua tetradactyla'').<ref name="Newman, Arnold 2002" />