High-speed Sprint Speed

I’ve posted in the past about the lizard sprint speed studies I’ve tried over the years on erhardii. Each of those experiments have come with the caveat that without a high-speed camera (shooting around 500 frames per second and costing the down-payment for a house) we can’t detect more subtle differences between lizard populations. Well, this year Menelia brought a beautiful high-speed camera from her home institution in Antwerp and we had fun finally getting a good look at these lizards on the run.

IMG_3501First steps, warm up the lizards. We used individual socks this year – a major innovation that made it a lot easier to be sure each lizard did their trial run before the next, and sped the process up without having to chase the lizard around the bin.

IMG_3512Then the white dots. These dots show up nice and clear in the video camera and help track the back of the head, the midpoint between shoulders and hips, and the middle of the back. Hopefully these will make processing the video a lot easier.

IMG_3515Here’s our setup. Note the two rainbow kiddie pools (hard not to notice them). This was a major improvement! The lizards would come rocketing out of the sprint speed track and land on the nice inflated pool floor, ready for us to scoop them up back into their sock.

Notice too that the sprint speed track has a couple of right-angle turns in it. One of Menelia’s questions deals with maneuverability and so we were anxious to see how well the lizards negotiated both the first, and second turns in the course.

IMG_3517

Here’s the camera’s eye view. Beautiful! Time to run the lizards.

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