Irruptive Bohemians

 

Perhaps three or four dozen Bohemian Waxwings graced the skies at one time. I tried to capture a flight shot, but only succeeded in capturing two in a tree.

The Bohemian Waxwings is perhaps the ultimate example of an irruptive bird. It lives in the north, but in some years, it travels in large numbers to the south in search of food.  This is such such a winter.

Two Bohemian Waxwings, out of a large flock, rest in a tree.

This detail of one of the waxwings shows the red, waxy tips on some of their wing feathers. The colour comes from carotenoid pigments found in the fruit waxwings eat.

 

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Wandering Elk

 

Recently, I had my first daylight sighting of two bull Elk who sauntered past midmorning with what appeared to be a breeding harem of maybe two dozen cows and calves.

During Fall mating season, Elk are polygamous. A mature male Elk (bull) will court and mate with many cows while protecting his breeding harem of cows (and their existing calves) from all other bulls. However, this local group of Rocky Mountain Elk had two large males with similarly well-developed antlers travelling together. I do not know why.
group of elk with 2 bull elk and 3 cows

The Elk group headed towards the nearby river and proceeded to slough through chilly water to arrive at a large flood plain on the far side of the channel. After they crossed, some began grazing on woody plants, grasses and leaves. But other Elk seemed to keep looking downstream and calling out.

Elk are social animals and it became quickly clear that some stragglers had waded to a small downstream island, rather than fully crossing the river. After much vocalizing, this wandering cow and calf began crossing the rest of the river in an effort to rejoin their larger family group.
two cow Elk crossing river

This Wapiti bull unwaveringly watched the wading wanderers. 
bull Elk with 5 to 6 point antlers

Meanwhile, at the other end of the flood plain, it appeared that a calf was nursing.
cow appears to nurse calves

I say appeared, because I’ve learned that our Rocky Mountain Elk calves tend to be born in May or June and weaned in the Fall. So, December seems rather late for nursing. Maybe this was just several minutes of intense sniffing or licking? If you are an Elkpert, I welcome your insights.

 

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Deer in suspension

 

White-tailed deer can bound; mule deer can bound, but can also stot. The bound is a variation of the gallop, but the hind and front legs act together rather than individually. The bound, the gallup, and the stot are all types of gaits the animal employs when it travels.

The first time I saw a deer seemingly suspended in air was when I watched a white-tailed deer leap over another. It had been standing on the left side of its neighbour, but chose to head to the other side. The bounding deer pushed off with its two hind legs, jumped overtop its neighbour, and landed beyond it when its two front legs touched down together. 

This morning my daughter, Cynthia, managed a shot of a white-tailed deer in mid-bound as it travelled across a field. As with the earlier deer, this one had pushed off with its hind legs and landed first upon its front legs. 

The bound is a distinctly different gait than that sometimes practised by the mule deer. In addition to the bound, they often stot. This gait involves pushing off with all four legs simultaneously, bouncing up into the air, and then landing on all legs at once. Travel is slower than when bounding, but the stotting gait allows a quick change in direction and easy climbing of hills. When in suspension, the leg position of those who stot is distinctively vertical, rather than spread. Here are two mule deer stotting.

My favourite shot of a mule deer stotting is this one taken by my wife, Dorothy. Notice how the position of its legs differs from that of the bounding white-tailed deer, above.

 

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Magpie feasts

 

We do not have many magpies around Kootenay Lake. This bird favours open country, and most of the lake is rimmed with forests. However, if you know where to look, we do have a few.

Black-billed Magpies have a wide-ranging diet: fruit, grain, insects, small mammals, and bird’s eggs. Unexpectedly, carrion is a particular favourite. Before today, I had never before seen magpies feast upon it.

A Black-billed Magpie flies in. What attracted it?

Quickly, it was evident that the appeal was the decaying carcass of a deer.

It set to work swallowing endless bits and pieces of the carcass.

Occasionally the magpie would fly back into the trees with a mouthful.

“This is good stuff; you should try it.”

 

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Bohemian Waxwings

 

About four dozen Bohemian Waxwings have arrived.

The Bohemian Waxwing is an irruptive bird. Usually it winters in the north, but occasionally it irrupts southward in large numbers and then delights watchers as the arriving flock feeds. Then another few years go by when either very few or none will be seen.

This is a view of a handful of the waxwings high in a staging tree. They have gathered adjacent to the one with the berries. They then fly to the berry tree in waves, grab some food and return to the staging tree.

A Bohemian Waxwing flies off with its prize.

 

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Midnight bears

 

You would think that any self-resecting bear would have bedded down for the season. But, no, despite it being mid-November and snowing, for a half hour around midnight last night, I was kept awake by two black bears foraging on rowan berries beside my home and even climbing from a tree onto the roof of my bedroom.

I chose to stay inside, judging that the difficulties and hazards of getting a good shot of a black bear at midnight were not worth the effort. However, I did discover that nighttime bears can be spooked by shining a spotlight through a window and into their faces.

The big fellow adjacent to my window could have been the twin of this earlier visitor.

 

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Feeder thieves

 

My home is equipped with bird feeders: three, sometimes four, of them. Recently, they have been vanishing. We have feeder thieves. 

Now, I am not talking about interlopers, such as squirrels, that merely steal the contents. I am talking about thieves that steal the whole feeder. I first encountered the problem of feeder thieves when a bear dragged the woodpecker feeder off about 40 metres and tore it open to get at the suet. The solution, which worked until recently, was to take bird feeders in at night, because thieves are usually nocturnal. 

That procedure worked until yesterday, when the finch feeder was torn off the the tree and just vanished. The thieves returned again today during daylight hours.

Raccoon: “I can smell the seeds; they have put up yet another feeder, one that looks like it is catering to chickadees, nuthatches and sparrows.

“Come on, let’s grab it before those bipeds spot us.”

“OK, I tore it off the tree and tested the contents. They are good. Now let’s drag it home.”

“Why did you stop us? We are hungry.”

 

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Pre-rut sparring

 

White-tailed bucks experience rising levels of testosterone in the fall and this leads to the rut, a gathering in November where bucks challenge one another for access to does. 

I have not witnessed the head butting and mating of the rut, but this last week, I was fortune to be able to watch some pre-rut sparring. Three bucks were congenially grazing together in the rain. There were no does to be seen. Yet, their rising testosterone was urging them to spar and they did, after which they just returned to grazing.

These were a mismatched three. There was an adult buck with four-points on each antler, along with one-spike and two-spike yearlings. But, fitness is irrelevant when grazing.

The sparring started when the two-spike youngster challenged the one-spike youngster. The contest just fizzled.

Then the youngster challenged the adult. It was a clash with butting and head twisting, but the adult appeared to be gentle with his young challenger.

They went at it a couple of times, with the adult seemingly reluctant to put much effort into the contest.

“Well, what did you expect me to do? He’s a youngster.”

 

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Not frost

 

A rough-hewn hand rail in the Park was covered with what I thought at first was frost. However, there was something odd about it: the ice was in the form of tiny towers. They looked different than all the hoar frost I have seen and more like ice extrusions.

Tiny towers of ice grow upward from the wooden hand rail. How were they formed?

The ice of hoar frost, below, is formed by the condensation of water vapour from the air. The arriving molecules move across an ice crystal to fit into the crystal lattice. These frost crystals look very different than the ice seen, above, on the wooden hand rail.

The ice on the handrail looked more like ice extrusions (geologists call them ice needles, but that is a term that means something different to meteorologists). When seen on the ground, the precursor of ice extrusions is water seeping into cavities in the soil. Then with low overnight temperatures, the water in these cavities freezes. When water freezes, it expands, and the ice now forces its way upward as extrusions rising out of the soil, and even lifts dirt atop it.

Not only do the towers on the wood look like tiny versions of the ice extrusions rising from soil, but they have formed on the cavity-rich sapwood portion of the wood grain rather than on the denser heartwood portion. It seems that our recent rains had filled the cavities in the sapwood with water which froze causing ice extrusions to grow out of the wood.

 

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October’s goulash

 

As these monthly goulashes go, this one is sparse. Only three images: two birds and a mammal.

Here a Bald Eagle dives off of its perch on a tree. This raises the question of why it dives, rather than just flies off. Flight is a unusual means of travel. Unlike ground or water travel, where the faster one moves, the more energy it takes, flight doesn’t work that way. Slow flight takes a great deal of energy to just keep airborne; fast flight takes a great deal of energy to overcome air drag. Between these, there is an optimal minimum-energy flight velocity. For the eagle this is about 12 metre/second (~43 km/hr). So an eagle needs to dive off a perch to use a gravity assist to pick up enough speed for optimal flight. Of course, that is also true of other birds.

Obtaining a shot of a bull elk deep in the forest is not easy. This is one was taken by Doug Thorburn, who shared it with me.

In the dying days of October, people began reporting the appearance of Trumpeter Swans from various places around the Lake. Here is one I saw.

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