Birdface

May182016

This week we learned that some birds aren’t so nice. In fact, they punish other birds so viciously that scientists are comparing their behavior to that of the mafia.

A few bird species, like the European great spotted cuckoo, lay their eggs in other birds’ nests so that they don’t have to spend the time and energy raising the hatchlings themselves. These birds act like a parasite, forcing the host bird to raise eggs that are not its own. But scientist were puzzled why the host bird did not simply throw the parasitic eggs out of the nest, and refuse to raise them. The answer it seems is the “mafia hypothesis.” This hypothesis suggests that host birds raise parasitic eggs because they are afraid of retaliation from the bird who laid them. Birds like the cuckoo will attack and destroy the nests of other birds who refuse to raise their young, killing all of the host’s hatchlings in the process. Because of this, it makes more sense for the host bird to expend the energy needed to raise the cuckoo’s young, rather than risk the safety of its own eggs.

The host bird’s reaction to parasite eggs in its nest depends a lot on the environment. If the bird’s nest has never been destroyed before, it is more likely to reject the unwanted eggs. Similarly, if there are fewer of the parasitic birds in the population, it is more likely to reject the eggs because there is less of a chance for retaliation. I still can’t help but feel bad for the host birds whose nests have been destroyed. Those cuckoos are a bunch of bullies!

Want to learn more? Visit https://www.sciencedaily.com/releases/2016/05/160518094714.htm

 

2 thoughts on “Birdface

  1. This is interesting…one of Larrea’s old Smarty Scoops that I am finally getting around to reading. I know about “parasitic” birds laying eggs in other species’ nests (like the Cow Bird). But I had never heard about the retribution — parasitic birds destroying nests if the host bird will not brood the foreign eggs. What do you know about this?!

    On Wed, May 18, 2016 at 2:00 PM, The Smarty Scoop wrote:

    > smartyscoop posted: ” This week we learned that some birds aren’t so nice. > In fact, they punish other birds so viciously that scientists are comparing > their behavior to that of the mafia. A few bird species, like the European > great spotted cuckoo, lay their eggs in other bi” >

    Liked by 1 person

    1. Oops! Sorry, All. I accidentally posted my musings about Cuckoos back to this list. I had forwarded this fascinating “Scoop” to my friends at the Bird Center for Washtenaw County because I know that they, too, would find it so interesting.

      Thank you, Larrea, for these wonderful tidbits of current science. Such info (and very clever illustrations) are just not available anywhere else. We love them! Keep ’em coming!

      Like

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