<div dir="ltr"><div class="gmail_quote">I fotgot that Tweeters doesn't accept photos so this was originally rejected.  Here is the url which might work:</div><div class="gmail_quote"><a href="https://www.theguardian.com/science/2023/jul/26/spot-the-difference-why-drongos-are-likely-to-clock-african-cuckoo-eggs-94-of-the-time?utm_source=Nature+Briefing&utm_campaign=3428505134-briefing-dy-20230726&utm_medium=email&utm_term=0_c9dfd39373-3428505134-47220256">https://www.theguardian.com/science/2023/jul/26/spot-the-difference-why-drongos-are-likely-to-clock-african-cuckoo-eggs-94-of-the-time?utm_source=Nature+Briefing&utm_campaign=3428505134-briefing-dy-20230726&utm_medium=email&utm_term=0_c9dfd39373-3428505134-47220256</a></div><div class="gmail_quote"><br><div dir="ltr">See attached photo but I'll explain.  An egg-parasitic bird has evolved such extreme egg mimicry that it can lay an egg that is 'indistinguishable' from the host's eggs, even though the host's eggs vary among individual birds of the host species.  BUT, the host is 'so smart' that it can still reject virtually all of the imposters.  But not all, so the parasite persists.  Equally amazing is that scientists have figured this all out.  Each group of 3 eggs is from a different host's nest;  that is, two different host birds and two different nest-parasites.<div>Bob OBrien  Carver OR</div><div>PS  I hope I got this all straight myself.</div><div><br></div></div>
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