The highest part or crown of a tree where the branches and leaves are most dense.
Compound of 'tree' (from Proto-Germanic 'trewwaz') and 'top' (from Old English 'topp'). Literal combination referring to the physical summit of a tree.
Birds navigate an entire three-dimensional highway system in treetops that humans rarely see, complete with predictable routes, traffic jams during migration, and rest stops.
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