Intruder Dynamics at Work

The start of any of my observation sessions involves always identifying WHO the coyote is that I’m watching. I use their faces to identify them because their coats not only change over the seasons as they shed and grow, but they also appear different under different lighting and weather conditions. Once I have their identity down, I of course can relate any behaviors I see to what I already know about the coyote.

To begin with, the coyote I began watching was facing away so I couldn’t positively identify him when I started. From his general shape I initially assumed he was the alpha male of the family that lived in this location. Several times he gave me a profile view, but that resulted in more questions than answers. And then I saw his face straight on and his light eyes: no, this was definitely not one of the coyotes who lived here — it was an intruder!

The coyote we saw faced away from us. When he finally looked over at us, we could see that this indeed was an intruder, not part of the resident family.

Coyotes are allowed to briefly pass through claimed territories without incident if they do so quickly, without challenging the resident coyotes. Intruders have been rare in this particular territory. Maybe there have been as many as five in this one territory in the entire time I’ve been observing — over the past 16 years — so it was actually special and exciting to see him there! A friend of mine and I watched intently. The coyote remained in the one location we had found him, standing most of the time, and then finally sitting down, always facing away from us.

While he sat there, the resident family began to howl. Were they aware of him? I don’t really know if the howling was related to him: it was not particularly intense or threatening, as far as I could hear. I took a short blurry video and have included that so that you can hear the family vocalizations and the intruder’s lack of vocal response. Although he remained quiet and did not respond to their howls, he was picking up as many signals as he could about the situation, and you can be sure that he was indeed reacting internally. The video is blurry because the camera automatically focused on the long surrounding grasses, but the important point is to hear the vocalizations, and see that this outsider listened intently. If he were part of the family he most likely would have responded. When the howling stopped, he slowly got up and began moving away from the area.

Walking away while continually looking over his shoulder to where the howling had come from.

We followed him for a short distance as he headed slowly, deliberately and decisively out of the park, but then we turned back — we didn’t want to interfere at all with his exit, we already knew he was headed out. We returned to where we had originally been, and within minutes both the resident alpha male and the alpha female rushed over close to where that intruder had been. And they too, faced the direction where they had been howling from, never actually going to the intruder’s exact spot. I suppose they will discover and explore that later. Probably their strong olfactory equipment had already let them know that the intruder had departed. They did not try to pursue him: it’s to coyote’s benefit not to engage in a fight which might injure them enough to prevent survival.

Mom and Dad rush over (top two photos) and remained in an anxious state of alert (bottom photo). Possibly they were keeping their eyes on where they knew the pups were.

After the very palpable bulk of tension had subsided, the alpha male wandered to the family’s rendezvous spot, but a youngster there must have sensed the tension because he remained on his back even though his dad was a substantial distance away. I suppose the family will be on higher alert for the next little while.

I’ve seen a number of intruders throughout San Francisco in the 16+ years I’ve been observing, and in each, something what I saw was a little different. I’ve seen an intruder simply turn and leave shortly after coming into a foreign territory and finding out what the situation was by sniffing — the resident family, as far as I could tell, did not even know he was there, though they probably sniffed his presence at a later time. And I’ve also watched territorial claimants hotly pursue intruders and even viciously attack in their effort to get that intruder to leave.

This time, we heard an intruder react to territorial vocalizations by quietly leaving, and the family react anxiously. Maybe the family saw him leave and knew he wouldn’t be coming back — there’s no reason for a fight here. Fighting happens only when one side won’t back down: you might recall Scout’s plight [search *Scout* if you are interested]. Other examples of intrusions can be found by typing in *intruder* into the blog’s search box.

Pup remains in his most submissive position as he reads Dad’s state of mind before he even gets near to the youngster!

The Intruder today looked like he was 2 or 3 years old — he would have been looking for a territory and a mate. Just like for humans, life’s various transitions for some coyotes are smooth and seamless, and for others there is much more effort and uncertainty as they search for openings and opportunities to improve their situations, and ultimately find themselves. I think this is a good way to look at their lives: as very parallel to our own.

Lapis’ Blue Eye

Lapis is a six month old pup born this year with one blue eye (the right eye) and one brown eye. She’s a beautiful if unusual coyote with slightly lighter fur than her siblings!

Apparently, blue occurs when there is a lack or reduction of melanin. Melanin produces brown eyes. This phenomenon occurs either due to genetic reasons or if there has been an eye injury.

At this point, I’m wondering if more could be going on than just a genetic color difference. There could have been an injury OR it might be that blue eyes have different anatomical properties than brown eyes in animals. In humans, for instance myself, blue eyes happen to be more sensitive to light than brown eyes — so there must be some, even if minor, anatomical difference. If blue eyes are more sensitive to light, I wondered if blue eyes see better at night than brown eyes. A Google search informed me that human blue eyes are more sensitive to light during the day, and by the same token, people with blue eyes tend to see better at night, unless there are bright lights. In other words, blue eyes allow more light into the retina. Wouldn’t this same physiology also pertain to animals? Biologist Carl Safina has pointed out that animals and humans actually have the same types of cells.

I ask this because Lapis appeared in one of my field infrared-lit cameras one night. See video below. Interestingly, her blue eye isn’t reflecting the light as well/as much as the other eye, in fact, the reflecting part seems to be a smaller circle of light than the brown eye, limited to the center of the eye. What is involved in the reflecting eyes is the tapetum.

The tapetum lucidum (Latin for “shining layer”) is the reflective surface in the back of the retina in some animals. It basically helps these animals see super-well at night by re-using the little light there is to maintain sharpness and contrast of an image on the retina — in other words, it increases the quantity of light passing through the retina by as much as 44%. It is also what causes the glowing eye phenomenon known as “eyeshine” which can be seen in night-vision cameras or when a flashlight is used. I see it in my nighttime infrared lit cameras. When there is an injury to the eye, this tapetum lucidum does not reflect the light — in fact, the animal looks like it has only one eye in the night vision cameras..

So there’s either a problem with the eye, such as an injury, OR blue eyes don’t form a fully reflecting tapetum surface because that would let in too much light. I’m coming to this conclusion based on this one case and offering it as food for thought and hoping for more input from other observers.

Further interesting reading on blue eyes. Unfortunately, I couldn’t find any articles on the quality of tapetum surfaces in blue eyes.

A raccoon with an eye injury: only the good eye reflects infrared light.

Coyotes Respond to Out-of-Doors Piano Music

Piano played at dusk in the out of doors in Golden Gate Park [internet photo]

“I was playing the piano by Conservatory of Flowers and coyotes started singing along. Wait til the end, its my favorite part”: Ash Temeña [Reposted with permission]

(an audio only video)


Of course, coyotes routinely respond to sirens, so their response to the piano would be a similar type of response. Responses to sirens can vary tremendously, from the mellow howling you heard above as they howled along with the piano, to much more high-pitched, short yips as you can hear below. And because I was less than 100 feet away, this recording has quite a different quality to it. If you listen right to the end, you’ll hear a short bark by Dad which actually puts a stop to the howling: Dad is controlling the situation. But several short growls followed that which are barely audible: these are continued vocalizations by Dad with two of his youngsters who were present with him: a two-year-old son and a one-year-old daughter.

To listen to more types of vocalizations and their circumstances, press here.

Another Rendezvous

In case you haven’t seen one, here is a family rendezvous that consists almost entirely of mutual grooming.

The family here includes Mom, Dad, a one-year-old yearling, and a two-year-old yearling. I’ve seen the young pups born this year, but they have not been part of the nightly rendezvous yet in this location because they’ve been raised some distance away due to disruptive dogs here: so the rendezvous at this location consists only of the adults to date. The adults in most families sleep during daylight hours away from the pups. The pups would be five months old in this video — they will have attained a pretty good size by now. After the rendezvous here, these adults then go trekking into the distance beyond the safety of this park where they meet up with the youngsters. Please remember that each family is different — this situation with pups ensconced further away is different from what I normally see.

The reason I’ve posted this video is to show how much grooming is going on between each of the individuals: this amount of grooming, in fact, is quite normal. I’ve broken it down in italics below if you want to know who is grooming whom. Basically, the yearlings groom each other, everyone grooms Mom. . . . . Knowing who is who is unnecessary for appreciating the mutual grooming, but If you want to know who is who, here is the breakdown.

Video begins with two year old son to the left; one year old daughter, Dad, and then Mom to the right: Son begins grooming Sister and then both youngsters groom Dad with Daughter moving over to the right at about :42.

At :52 Son and Daughter groom Dad with mom in the background. At about 1:00 Daughter begins grooming Mom.

At 1:05 Son reaches between Mom and Dad to groom Daughter on the right as Daughter grooms Mom and Dad looks at us.

At 1:34 Son stops to scratch himself and Daughter continues to groom Mom and then grooms Dad as the video ends.

Grooming serves multiple purposes: to get rid of bugs, it confirm ranks and it strengthen bonds. The grooming went on for about 20 minutes — this is just a short section of that session over a month ago (8/25)