Why is hay in the treetops?

Why is hay in the treetops?

Most of the ‘hay in the treetops’ are found in African countries, south of the Sahara. They are clumps of dry grass hanging from branches. What are they?

The mini clumps and balls of hay are bird nests. 

They are the nests of weaverbirds. Weaverbirds weave grass and leaves, usually dry grass, into small nests on the branches of trees.

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