Wildlife photographs

As I’m in a rush preparing to leave (and Wildlife Photo posts take a while to put up), so let me be lazy and post three tweets sent by the estimable Matthew Cobb, who follows Twi**er.  They are all animal-related, so they fit here.

Since I’m not taking readers’ wildlife photos with me, if you send some when I’m gone, they’ll likely be posted almost immediately. But be sure the photos are good!

First, this one. Now the resemblance to a jumping spider is conjectural, but it sure looks like one to me. The question is this: the predators who presumably avoid this butterfly because of the markings must have had some experience encountering jumping spiders (otherwise they wouldn’t learn to avoid them—or have evolved to avoid them). But the predators on butterflies are often birds, and these aren’t attacked by jumping spiders. Your quiz question: if this is indeed an evolved mimetic pattern, what would be the selective pressures that could produce it?

Here’s one jumping spider for comparison. The prediction, of course, is that there must be a jumping spider with nasty effects on some butterfly predator living in the same area as the gemmed satyr. According to Wikipedia, the butterfly, (Cyllopsis gemma) is a nymphalid found in the SE US and NE Mexico. 363e99009de0328c57d3b2e69ef5adb2

Now, for a certain case of mimicry, have a look at this photo. Nope, that’s not a bee but a MOTH (note the antennae).

This is a truly remarkable case of mimicry. As the Flickr page describes:

Clear-winged Moth (Sesiidae). YES! A moth!

I see my fair share of Lepidopteran wasp mimics, but this is the most convincing bee mimic I could imagine.

Pu-er, Yunnan, China

Here’s a screenshot I took from the Flickr picture so you can see the mimicry better:

screen-shot-2016-10-25-at-7-33-21-am

And finally, some lovely mountain gorillas. What are they saying? (Be sure to put the sound on.)

13 Comments

  1. Posted October 25, 2016 at 8:58 am | Permalink

    Little Anolis lizards, praying mantis, robber flies, and tree frogs come to mind as possible butterfly predators that would not like to tangle with the fangs of a jumping spider.

    • John Harshman
      Posted October 25, 2016 at 9:24 am | Permalink

      There are various other possibilities that occur to me too:

      1. The spider isn’t dangerous or distasteful but merely difficult to catch and so not worth the investment to attack; this too might benefit a mimic.

      2. The mimicry is a false target, encouraging predators to attack the wing, thus letting the butterfly escape.

      3. Pareidolia.

    • Mark Sturtevant
      Posted October 25, 2016 at 9:27 am | Permalink

      I was thinking this as well, along with providing protection from real jumping spiders.

    • eric
      Posted October 25, 2016 at 10:24 am | Permalink

      Yeah, there are lots of non-bird predators of butterflies. It might not scare birds, but I bet looking like this scary predator is still better than looking like none of them!

    • Gregory Kusnick
      Posted October 25, 2016 at 12:56 pm | Permalink

      My first reaction to Jerry’s question was that it assumes facts not in evidence, namely that “predators […] avoid this butterfly because of the markings”.

      Is there a way to test that? Say by some sort of catch-and-release experiment in which you paint over the markings on some individuals, and then recapture them later to check for differential survival?

  2. John Harshman
    Posted October 25, 2016 at 9:18 am | Permalink

    The bee mimic seems to be enjoying some tasty bird poop. I wonder what he/she gets from it.

    • Mark Sturtevant
      Posted October 25, 2016 at 9:27 am | Permalink

      I would guess amino acids, which could be low in a nectar diet.

      • John Harshman
        Posted October 25, 2016 at 9:41 am | Permalink

        In which case, probably she.

  3. Randall Schenck
    Posted October 25, 2016 at 9:53 am | Permalink

    That jumping spider would be great in a monster movie. And very colorful.

  4. Dominic
    Posted October 25, 2016 at 9:56 am | Permalink

    The spiders can hear you… be careful what you say!
    https://entomologytoday.org/2016/10/17/jumping-spiders-can-hear-sound-despite-having-no-ears/

    • John Harshman
      Posted October 25, 2016 at 11:42 am | Permalink

      Why ask Jerry? He isn’t a paleontologist. You can read the abstract here, if that helps:

      http://onlinelibrary.wiley.com/doi/10.1111/2041-210X.12666/full

      This is an argument about how to correct for one sort of sampling bias in assessing the relative diversity of paleocommunities. The authors find one particular method seriously flawed.

  5. keith cook +/-
    Posted October 25, 2016 at 6:07 pm | Permalink

    First, bloody amazing that butterfly and moth.
    The pressure for the mimetic pattern to my mind could be is to deter birds by diverting any investment to expend energy and time on a non preferred low return choice.
    Any terrestrial creatures that would feed on them would be sent packing or freaked by a eat or be eaten dichotomy.
    Two bangs for one buck?
    Other than that, both butterfly and jumping spider (a ghost meal) are fair game to a predator who cares little for games.


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