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Showing posts with label combat. Show all posts
Showing posts with label combat. Show all posts

A tussle at the den?

Thursday, June 14, 2012

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I am currently reviewing all the footage from the dens this past spring and will have many things to share very soon (until then, you can see a new timelapse photo almost daily on our facebook page). Recently, I came across some rather unusual behavior:



What's unusual about this? Well, interactions among snakes at our dens usually look like this, where snakes just appear to be resting with each other:




So what's going on in the first video? We have never before seen any reproductive activity (male combat or males courting females) at our dens, but we think this might be combat. This timelapse video was taken at 30 second intervals, so much of the fighting action is lost. Also keep in mind, if you've never seen rattlesnakes fight, it's gentler than you might expect (not our video):


For years people thought that combat, or the so-called 'rattlesnake dance,' was courtship between males and females. Like many animals, rattlesnake combat is largely ritualistic and rarely involves biting. The goal is to topple your opponent, similar to professional wrestling (hence the twisting to be 'on top' in the above video).

For comparison, here's a male Arizona black rattlesnake courting a female:


So what do you think is going on in the timelapse video at the top of the page?




Ménage à trois (part 2)

Thursday, August 11, 2011

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(if you haven't already, see part 1)


When we left our 3 gophersnakes, Bluto had just interrupted courtship between Popeye and Olive Oyl and was biting Popeye repeatedly along his body. Popeye released his bite-grip on Olive Oyl and she fled so fast that we were unable to follow. Bluto continued biting Popeye, making him to wince but not retaliate. Instead, Popeye seeks refuge in a nearby burrow. In his fervid biting, Bluto barely notices that Popeye has escaped, actually biting himself a couple times by mistake. Finally realizing that his competitor is sidelined, Bluto resumes searching for Olive Oyl, who had a 2 ½ minute head start.


Bluto appears to be in a hurry, and while he initially showed brief reactions to close encounters with us, he no longer expresses concern. He flicks his tongue almost continuously, halting almost imperceptibly several times a second to deliver particles into his mouth. Undoubtedly, Bluto is following traces of Olive Oyl, but apparently her trail is not clear. He travels in wide loops, backtracks, and even ascends a pine tree. Perhaps Olive Oyl has passed through this area more than once. And the wind must make his search even harder!

Popeye’s urges can wait no longer. We find him peering from the burrow only 3 minutes after entering. After five more minutes, he locates Olive Oyl’s scent trail, and heads off in the same direction as the other two.


He appears to be a little more careful than Bluto, pausing to hone in on the path ahead. We try to keep tabs on both males as they move about, but we are distracted by a beautiful rattlesnake and Popeye slips away.

DSC_6448

After about an hour Popeye reappears, coming within just a few meters of Bluto. He appears to pass Bluto, and we again lose him as he cruises on through the vegetation. Finally, at 1417, 80 minutes after we last saw her, we find Olive Oyl being courted by Popeye on open ground beneath a tree, 113 meters NE of their roadside rendezvous (see part 1). Moments later, Bluto finds the pair, Olive Oyl slips away, and conflict begins anew.


In a repeat of part 1, Popeye is first to find and court Olive Oyl, but they are interrupted by latecomer Bluto, and the female flees. With an enduring calm, Popeye once again slips from Bluto's sway.


To be concluded...

Ménage à trois (part 1)

Wednesday, June 15, 2011

29 May 2011 – House Rock Valley – Northern Arizona

In 1996, The Peregrine Fund reintroduced California condors to northern Arizona. Once down to a mere 22 captives, there are now nearly 200 condors flying free in the southwestern US. We visited northern Arizona in hopes of finding snakes beneath soaring condors.

condor 126
condor in flight


We learned of a trio of condors (2 males and a female) raising a chick in a cave overlooking House Rock Valley. Like Arizona black rattlesnakes, condors are social: they forage and roost in groups in which immature birds learn from experienced adults how to find food and appropriate resting sites. So it is perhaps not so unusual for a nest to have an "extra" adult male helper. We attempted to see this trio of nesting condors, but the wind howled so fiercely that we were barely able to fix a binoculared gaze on the cliffs above us. Besides, would an animal choose to be out in such unpleasant conditions? We thought not, and decided to find a place to explore that would shelter us from the wind. The valley bottom, with stands of juniper and islands of protruding sandstone, looked to be such a place.

We followed a dirt road and arbitrarily selected a place to park. We threw on our packs and crossed the road, noticing a long, dark form on the road we’d just driven. We approached to find a gophersnake (let's call him Bluto) whose chocolate ladder of blotches contrasted beautifully against a pale yellow background color. Surely realizing his vulnerability, Bluto headed directly to a juniper at the road’s edge. By the time we drew our cameras, he had found a burrow and disappeared into it. Our lamentations of his escape were short-lived, because in an adjacent sagebrush lay not one but TWO gophersnakes. Given the season and the apparent amorous nature of their entanglement, we surmised they were a male and female pair (let's call them Popeye and Olive Oyl).


Olive Oyl maintains a wary eye while Popeye's attentions are consumed by his potential partner.
Olive Oyl maintains a wary eye while Popeye's attentions are consumed by his potential partner.


After three or four minutes, the couple tired of our presence and retreated into a burrow on the opposite side of the sagebrush. Surprisingly, Bluto was already making his comeback:


Bluto, the largest of the trio, assessing threats topside.
Bluto, the largest of the trio, assessing threats topside.

Rather than try our patience against reptiles, we decide to explore the area for a while and come back later.

habitat

After about an hour we make our way back to the gophersnakes. As we walk down the road toward the spot, we see Olive Oyl meandering through the roadside vegetation, about 10 m from where we initially found her. She turned as if to cross the road, but paused before entering the barren dirt roadway.

Olive Oyl

After a couple of minutes, Popeye came cruising through the same grass she’d just passed. We watched him make several wide loops, even coming within a couple meters of her before turning away. Meanwhile, after remaining motionless for several minutes, Olive Oyl turns and moves slowly from the road. Popeye finally comes upon Olive Oyl, grasping her with his mouth behind her head (see video at 0:41). Feeling vulnerable, perhaps because of our presence, Olive Oyl is able to slowly worm to what cover is afforded by a small shrub.




Bluto enters the stage from the same area as the other two, vaguely following the same path. We watch as he loops and circles, at times retracing his path backwards. He approaches the pair within a couple meters several times, and even passes by our feet, which gives him only momentary pause. Finally, his search is over.


Bluto immediately begins biting Popeye. Finally, Popeye is induced to release his grasp of Olive Oyl. Without delay she flees and we lose track of her. Although Popeye flinches and squirms with apparent discomfort from the biting he receives, he does not appear to retaliate in kind. He escapes the assault by disappearing into a burrow in the lower left quadrant of the frame. Once Bluto realizes his rival has fled, he turns his attention to Olive Oyl, following the exact path she used to escape the dispute.

To be continued....