Recent Tail and Eye Injuries

I want to make folks aware that injuries and ailments abound in the coyote world. Here are three youngster coyotes, all 8 months old, who have conditions to contend with which will impact them moving forwards.

Probable Glaucoma from an Injury:

I’ve recently posted about Lapis’ condition, above. Her right eye, from the time I first noticed it when she was about two months old, was blue. It remained this way for many months, but about a month ago that eye suddenly looked quite different: I don’t know if this is a developing condition, or if it is the result of trauma, so I contacted an animal veterinarian eye specialist who diagnosed her condition through photos as follows: “From what I can tell from the picture, the right eye likely has glaucoma (increased internal eye pressure.  The lens within the eye is probably shifted rearward (posterior lens luxation).  The right eye is probably blind, but appears to be comfortable as there is no squinting evident.  Could be from a traumatic injury.”

The eye indeed looks glassy and blind, and from her behavior, it doesn’t seem to be painful. Without a second eye, she would have no depth of field, so this definitely will impact her survival skills. However, coyotes are resilient survivalists, and I expect her to live as full a life as any of the other coyotes. At this point in time, she plays with her siblings and hunts, but she is not adventurous when it comes to exploring new places: she prefers the safety of her immediate area. Then again, a sister of hers from last year’s litter behaved in this exact same way without such an affliction, so the eye may be having no effect at all on her life, so far.

Probable Corneal Edema from a Virus:

This youngster visits a backyard about once a day, so a human was able to take these concerning photos. The cloudy eyes are alarming, so we sent these photos to the same eye specialist as before. His response:

The clouding of the eyes could be due to corneal edema.  Since this is a youngster, I would suspect some sort of systemic infection caused inflammation of the cells lining the interior of the cornea (endothelial cells).  One possibly is canine adenovirus type 1, which causes a viral hepatitis.  This can cause corneal edema due to endothelial cell inflammation.  Vision is present, but it is going to be hazy.”

A friend and colleague of mine who knows coyotes well tells me that generalities are always broken by coyotes. I.E., there are exceptions always. My own take is that this fella is compromised which will affect the quality of his life, but then again, he might be the exception. I can’t imagine an easy life with hazy vision. However, he has a safe-haven in someone’s backyard which he can retreat to. He is welcome there whenever he wants. Nonetheless, he’s a male and males have strong drives: he’ll want to find a mate and claim his own territory at some point. But let’s see how his story develops. As long as he returns to his backyard safety zone, we’ll be able to get updates.

Caudectormy from an accident or injury:

And then this shocking injury occurred within the last month: a completely severed tail. We have no idea how this happened, but when it was first observed, the cartilage was exposed and the wound was furious red. However, as we all know, coyotes are resilient, and the little female seems to be recovering and is functional, and hopefully out of pain at this point. If you see her, please leave her alone: her tail cannot be restored, and she already is healing. Remember that what is most important to these coyotes is their families and relationships within those families. Allowing them to remain with their families until they are ready to disperse is crucial for their well being. Unless a wild animal is immobile, or has mange, we leave most alone, allowing nature to follow its course.

For more urban coyote injuries and ailments, see Injuries and Ailments: a coyote’s life is hard and short.

Lapis: Update

You might recall that Lapis is the one-blue-eyed coyote pup I wrote about several months ago. I saw her a few days ago at almost 8 months of age: an update is in order. The change that struck hard is that the bright blue right eye of hers is no longer blue. The iris of that blue eye is now double the size of a regular eye — it almost looks like a glass eye. The iris is the colored structure in the front of the eye that regulates the amount of light that can enter the retina by controlling the size and diameter of the pupil. I don’t know how much light her eye lets in, but I would assume it is affected by the iris’s size. It seems obviously damaged or diseased, but it doesn’t seem to impact her activity.

Health issue in urban coyotes can develop at any time, but it’s sad when they develop early, as with this eye condition. I hope it’s not something that impacts her life too much. Last year pups in several of the coyote families developed neurological walking problems which they were either born with, or they developed very early after birth, possibly due to distemper. Other ailments I’ve encountered can be found HERE.

The day I saw Lapis, she was with one of her brothers and demanded that he interact with her: it was almost sparring behavior without the need to win. She’s comparatively petite compared to him but that didn’t stop her from engaging with him as an equal. He, on the other hand, I could tell, was careful not to overpower her. The roughhousing and wrestling he engages in with his brothers did not occur here.

I don’t know if he knows that something is wrong with her eye, but I would guess he does: coyotes are super aware of temperature differences, smells and visuals. For instance, they seem to know exactly where the hidden ticks are on each other. In another instance, I watched the mate of a young fellow sniff his broken ankle when that happened, and I knew that she knew it was injured and hurt him.

Below is a gallery of photos I took that day showing the sparring and interactions between these two siblings. The strong bond between them encompasses caring, playing, teasing, provoking, patience, and affection, in addition to warm companionship. Coyotes are hugely social and it is obvious that this relationship is important to both of them, and possibly is the highlight of their day. Things to notice: their communication through intense eye-to-eye contact, her jabbing him with her forepaws, affectionately biting his ear, biting his neck, grabbing his hindquarters, grabbing his head, putting her head over his shoulder, as she incited him to react to her. Notice he calmly allowed her to poke and flit as she pleased, and then gently and affectionately — almost protectively — reacted companionably more than anything else! [You can click on one of the photos to then scroll through them].

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.