multiple URLs

Are there any drawbacks to having multiple registered domain names (URLs) point to the same website?

So, for example: (URLS are fictitious not responsible for what u may find there lol)

1. Main Site is birdfeeding.com
2. but also have howtofeedbirds.com and wherebirdsliketonest.com and makingbirdshappy.com all also pointing to the birdfeeding.com website.

submitted by /u/Yonkers1954
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from Search Engine Optimization: The Latest SEO News https://www.reddit.com/r/SEO/comments/dl1gvt/multiple_urls/>