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