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Compact Endothermic Mouse Defrosting Unit (CEMDU)

The calendar is changing over to October, which means fall migration is in full swing.  It’s not a cheery time for a birder in South Dakota!  Winters are long, and bird species and numbers are both WAY down compared to the other three seasons. However, there are a few bright spots!  What “saved” winter for me a few winters ago was the sheer delight in finding a species I’d never seen around southeastern South Dakota.

Up until that winter (3 years ago, 2015-2016), the only place I’d seen a Northern Saw-whet Owl was along the Missouri River near Pierre. Birders there found that they liked to winter in the cedar trees along the river. There are a few areas around my part of South Dakota that also have thick stands of cedar, so I thought I’d spend some time that winter searching for the little guys. It was very discouraging at first.  It’s not easy searching through the thick cedar stands! I started in mid-November, searching for signs…the “white-wash” of their poop that you can find on the ground and branches below a daytime roost, or actual regurgitated pellets.  I DID occasionally find owl-sign, but for a good month…no owls.

Then in late December 2015, I went to Newton Hills State Park. Birders had reported hearing a Northern Saw-whet Owl during a Christmas Bird Count, so I thought I’d leave before dawn, and spend several hours looking.  It was a miserable day…cloudy with a very thick, icy fog, and I got a later start than I had planned. By the time I got there, the sun had already risen, and I was sure I wasn’t going to hear any calling owls. However, the fog was SO thick, that it was still relatively dark and gloomy when I arrived. It was only moments after stepping out of my car that I heard a calling Saw-whet Owl!  I headed in the general direction, and by the time I got close, the owl had stopped calling. I slowly made my way into the cedar thicket, and almost immediately found fresh looking signs that an owl had been there. White-wash on the ground as well as pellets!  I then slowly raised my head, hoping to see an owl sitting in the branches directly above the whitewash.  No such luck!  DAMN….IT.  After spending so much time looking, I was getting frustrated and was convinced I’d never actually find one.  I turned around to head out of the thicket, took about 3 steps, and walked into a commotion just above my head.  Owl!  He was only about 6 feet away from all the whitewash, but in a different spot, and I had accidentally caused him to flush when I walked past.

AAAARRGGGGHHH!!! I was at once both happy that I actually got a glimpse of an owl, but frustrated that I missed seeing him before I got so close he flushed. No photograph. Sigh. I continued the search though, and about 15 minutes later, found another location with whitewash and pellets.  And this time…success!  I looked directly above the whitewash, and staring back down at me from about 10 feet up in the cedar tree was a gorgeous little Saw-whet Owl!

I had a blast the rest of that winter. I found several more in the Newton Hills Area, and also 4 more near Lake Alvin just south of Sioux Falls. Overall that winter I found at least a dozen different Northern Saw-whet Owls!  What was striking was how incredibly tame they were. That first owl on that foggy morning was the only one I saw that winter that actually flushed. Several times I was able to approach an owl and get mere feet away, and instead of flushing, I was typically greeted by a disinterested yawn.

This photo is one of my favorites from that winter. Northern Saw-whet Owls are tiny critters.  Their prey is often small voles and mice, but even those are too much for them to consume in one sitting. They will often catch a vole or mouse, eat half of it, and cache the other half in the nook of a tree branch. They then come back later and retrieve the cache, but in our cold winters, they have to thaw it before finishing their meal.  Thus, I’d read you could sometimes find a Northern Saw-whet Owl “defrosting” a mouse.  One morning I was lucky enough to witness such an event, as this grumpy-looking guy was busy defrosting breakfast when I came across him.

A “Compact Endothermic Mouse Defrosting Unit”!!  One of my favorite memories from that winter. As the weather turns colder here, I’m hoping to again find these handsome little birds this winter.

Northern Saw-whet Owl - Aegolius acadicus

A Northern Saw-whet Owl, defrosting it’s morning breakfast.

Saw-whets are a’ comin’!!! For now, a drawing…

Colored pencil drawing of a Northern Saw-whet Owl - Aegolius acadicus - By Terry Sohl

A colored pencil of drawing of a Northern Saw-whet Owl. I couldn’t wait until they arrived for the winter, so in the meantime sat down and drew one.

Last winter was a blast.  OK, that’s not something you typically say when you live in frigid South Dakota, but I really enjoyed last winter, and am looking forward to the cold weather again.  The reason?  Northern Saw-whet Owls!! Prior to last winter, I’d seen them on rare occasion, when I went to the Pierre area. It was a quite a few years ago when birders in the area started looking for them in cedar tree thickets near the Missouri River.  It takes quite a bit of work to find one however.  Looking for Saw-whet owls typically involves bush-whacking through dense cedar thickets, looking on the ground and on tree branches for the tell-tale “white-wash” that accumulates when the little owls use the same roost day after day.

When I say I’d seen them on “rare occasion”, it was literally ALWAYS finding a bird that someone else had found.  Oh sure, I’d given it the ol’ college try.  Prior to last winter, there were a number of times that I myself would go tromping through cedar thickets in Pierre, trying to find the little owls.  I was great at finding roosts where they USED to be!  As for finding a live owl?  Not so much.

I think people always suspected Northern Saw-whet Owls were much more widely distributed in South Dakota in the winter, but actual reports were few, likely due tot he effort involved in actually finding one.  Last winter I was determined to 1) actually find my “own” Saw-whet owl, and 2) do so right here near Sioux Falls, rather than making the 3 1/2 hour drive to Pierre, where they’re known to be found.  It wasn’t very encouraging at first.  And when I say “at first”, I mean there were probably about 10 fruitless trips trudging through cedar tree thickets, looking for owls.  The story was much like my attempts in Pierre…I was GREAT at finding owl pellets and whitewash, but wasn’t finding the owls themselves.

That all changed in January when I finally found my first Northern Saw-whet Owl in southeastern South Dakota.  It was at Newton Hills State Park, and he wasn’t alone!  On that truly magnificent day, I found not one, but four different Saw-whet Owls, all in the typical cedar thicket habitat that was similar to where they had been found for years in Pierre.  At least according to “eBird” reports, these were the first Saw-whet Owls reported in this part of the state.  The rest of the winter was great, going back to visit previously found Saw-whets (they tend to have roosting site fidelity, using the same sites for many days in a row), and finding new ones.  I ended up finding a few more at Newton Hills that winter, and then also started finding them  around Lake Alvin, just south of Sioux Falls.  For the winter, at least 9 individual over-wintering owls were found.

Just in the past few days bird banders in the area reported capturing and banding the first migrating Saw-whet owls of the season.  They’re here!  Or, at least they’re starting to arrive!  I’ll probably wait a couple of weeks before heading out to actually look for one, giving them a little more time to arrive, giving a little more time for the whitewash and pellet evidence to accumulate.  In the meantime, last weekend in my excitement for the coming winter, I did a colored pencil drawing of a Northern Saw-whet Owl, using a photo of one from last winter as a guide.

I can’t wait!  The owls are coming! The owls are coming!!  🙂

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