The Tree's Knees (1931) - Public Domain Cartoons

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Summary
Bosko wanders through the forest with an axe, and finds a tree, but the tree turns out to be alive and the surrounding saplings (presumably its children) beg Bosko not to chop it down. Bosko then engages in a song-and-dance routine with the trees, until he is distracted by and follows a butterfly, leading him into another song-and-dance routine with several other living trees and the animals of the forest.