The Institute for Bird Populations - House Wrens often put spider eggs sacs in their nests. One hypothesis is that, once hatched, the spiderlings help control nest parasites like mites. This proved
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File:Spider's egg sac - geograph.org.uk - 541956.jpg - Wikimedia Commons
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Jacob Wycoff on Twitter: "We got another round of baby robins on the front door. 🪺 more “fecal sacs” to follow. https://t.co/QSrquRCLYs" / Twitter
Blue Grosbeak Removes Fecal Sac From Nestling - YouTube
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Fecal sac hi-res stock photography and images - Alamy
