Explain how the shape of a finch's beak is an example of an adaptation?

The shape of a finch's beak is an example of a adaptation because the shape and size of there beak  helps them get whatever food is available to them. for example, a finch with a flat, wide beak is better adapted to eating berries and cracking nuts and seeds. 

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What is the example? i’ll be happy to answer if you can tell me : )

Aliving thing consumes berries on a yree