Matching Pairs CEDES19/20 - NAT6 - Unit5 Act2Online version Match the two columns. by Javier David Panadero 1 Understory layer 2 Forest floor 3 Emergent layer 4 Canopy layer Trees are usually about 50 or 60 metres tall. Part of the forest made up of trunks, branches, bushes and shrubs. Birds, mammals, insects and reptiles all live up here. Many never leave the treetops and spend their whole lifecycle here. Part of the forest that belongs to invertebrates, fungi and bacteria.