Woodpeckers tap on tree trunks. They are looking for insects to eat when they do this. Woodpeckers have a red head.
Woodpecker !
woodpecker
woodpecker
A Woodpecker
Tree trunks is that trees middle position.
tree trunks have xylem and phloem
Trunks
Lichen is a combination of fungus and algae. It grows on tree trunks.
A woodpecker, when trying to get bugs in a tree, uses its sharp beak to "drill" a hole in the tree, making loud tapping noises, hence the name "woodpecker"
woodpecker
Algae or mosses live on tree trunks.
Tree trunks are straight and branchless in their lower parts in their efforts to grow tall.