Robo-squirrel flags snakes with infrared tail
UC DAVIS (US) — Scientists are taking robot squirrels into rattlesnake country near San Jose, California to study how squirrels and rattlesnakes interact.
In the lab, robot squirrels have shown how squirrels signal to snakes with heat and tail flagging. Through field experiments, researchers from University of California, Davis and San Diego State University aim to learn more about rattlesnake behavior.
The research on the long struggle between California ground squirrels and their main predator, rattlesnakes, began under the leadership of psychology professor Donald Owings, an expert on animal behavior, who died in 2011.
Sanjay Joshi, professor of mechanical and aerospace engineering, built the original “robosquirrels” for Owings, and is now working with Rulon Clark, assistant professor of biology at San Diego State University and an expert on snake behavior.
The research then and now centers on two squirrel behaviors in reaction to rattlesnakes: a tail flagging movement and the warming of the tail. Owings, with professor Richard Coss and colleagues, observed that when adult squirrels detect a snake, they approach it headfirst in an elongated posture, making flagging movements with their tails. Owings and Coss noticed that when confronting a rattlesnake, the squirrels also heated their tails.
Because rattlesnakes can “see” in the infrared, the researchers thought the squirrels might be sending a signal to the snakes. But, with live squirrels, there is no way to separate tail flagging from tail heating.
Enter the robots. Joshi’s engineering lab built a squirrel with a heatable tail and a tail flagging mechanism, each controlled separately.
Using the robosquirrel, Aaron Rundus, then a graduate student in Owings’ lab and now an assistant professor at West Chester University in Pennsylvania, showed that the snakes responded to the heat signal from the squirrel.
“It was the first example of infrared communication in the animal world,” Joshi says. That work was published in 2008: an article published in IEEE’s Robotics & Automation Magazine in December 2011 summarized much of the work to date.
In the field
Fieldwork is more challenging, he says. Ryan Johnson-Masters, a graduate student in Joshi’s lab and now at the Sandia National Laboratory in Livermore, built a new robot with smaller and more robust controls that was easier to transport into the field.
The field season is fairly short, a few weeks in late spring and early summer when squirrel pups are born and rattlesnakes come hunting for them.
Then you need to find rattlesnakes in rough country. “It’s definitely an adventure,” Joshi says.
Once the researchers have located a foraging snake, they put down some track, set up the robosquirrel and a video camera to record the scene and retreat behind a blind. The snakes seem to accept the robosquirrel as real, Clark says. One of their videos shows a snake biting the robot’s head.
Snakes will rarely strike at a flagging adult squirrel—and if they do they almost always miss, Clark says.
“Squirrels have a remarkable ability to move out of the way of an oncoming snake strike,” he says. Even adult squirrels that do not seem to be aware of a snake will often successfully dodge a strike.
Squirrel pups are much more vulnerable. They have less resistance to snake venom and seem more reckless in their behavior. They show the same displaying behavior as adults, but will get closer to snakes—sometimes with fatal results.
Although not much is known about the mental abilities of rattlesnakes—they are not ideal lab animals, after all—they do behave in the field as if they are making complicated assessments about foraging behavior, Clark says. For example, they react differently to adult squirrels versus pups.
Why do squirrels approach the snakes at all? Clark says that they may be trying to assess the nature of the threat. Sometimes snakes will leave the area after encounters with squirrels.
“The reason I’m so excited is that with robots we can really change how animal behavior studies are done,” Joshi says.
The National Science Foundation funded the study.
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