Showing posts with label asio otus. Show all posts
Showing posts with label asio otus. Show all posts

Thursday, February 28, 2013

Long-eared Owls in willow thicket!

Yesterday, along with a few other folks, I found myself skirting along a large wetland complex in the western marshes of Lake Erie. It was a gloomy, overcast day, with wet snow/rain spitting constantly in hypothermia-inducing temperatures. Nonetheless, spring was in the air, if one were to believe the birds. Flocks of blackbirds were here and there, and the boldest of the early returning male Red-winged Blackbirds were teed up and proclaiming their territories with guttural conk-ah-REE-onks! Waterfowl were on the move, and scores of Tundra Swans were moving about, restless to push on north to their Arctic breeding grounds.

In spite of all the conspicuous avian action, our attention was riveted to the innocuous looking willow thicket above, at least for a memorable while.

This shrubby copse is just like acres and acres of the same stuff in Lake Erie wetlands, but this patch held a special treat. In fact, I suspect that many such thickets hold the feathered treats that we'll behold in just a second - it's just that few people look for things in such places.

Look closely - we're being watched! A Long-eared Owl, Asio otus, peers out at your narrator and his companions. This owl and its compadres were devilishly hard to spot in the dense willows. As we scanned the patch and ogled an owl, more would come to light. At one point, I was drawing a bead on this bird with my camera, and noticed another owl, barely visible, in the backdrop. We tallied four but I bet more were present. Our reluctance to disturb them precluded more aggressive surveying.

By sidling along the roadway, some fifty feet away, we were able to discover open portals into the thicket and clearer views of some of the owls. This is where my 500 mm lens really comes in handy. It isn't necessary to impinge on the birds' comfort zone in order to make decent photos. I also had my scope along, and was able to set that up a fair distance away and still provide everyone with killer looks, same as in this photo. The owls noticed us, obviously - what do they NOT notice? - but never showed signs of being on high alert.

Take a close look at this owl. A very cool and almost surreal element of owl physiology is on display.

The owl in the previous photo, and the chap above were both facing away from the road. But wait - they're still looking directly at the camera! Owls have fourteen neck vertebra, double our seven, and that allows them to twist their neck nearly 180 degrees and look directly behind them.

Long-eared Owls are not a rare bird, and are common throughout much of the northern boreal forest. They stage poorly understood southward movements in winter, and are regular visitors to Ohio and other states south of their primary breeding range. There are undoubtedly FAR more Long-eared Owls around than is supected, and when one sees these masters of camouflage imbedded in a dense willow thicket such as this, it becomes apparent just how easily they can be missed.

I think many Ohio birders have a skewed perception of Long-eareds' winter habitat, because so many people are used to seeing them in the pine groves at Killdeer Plains Wildlife Area and other select conifer groves. But it should be remembered that, with the exception of the Red Cedar, Juniperus virginiana, and Virginia Pine, Pinus virginiana, conifers are rather local and limited in distribution in Ohio. And even the two aforementioned species are not common statewide, and the other five native species suitable for owl roosting are very limited in distribution. In several areas where Long-eared Owls regularly turn up roosting in conifers, such as Killdeer Plains, there are NO native conifers or at best a smattering of Red Cedar. The birds are roosting in artificial plantings.

On several occasions, I've seen Long-eared Owls roosting amongst the dense gnarled branches of Pin Oak trees, Quercus palustris, and I suspect that's where the Killdeer Plains pine grove birds retreat when the human presence becomes too much. Pin Oaks are often very common in and around good Long-eared sites. They also favor dense grapevine tangles, which are found nearly everywhere, and good luck spotting owls in such haunts.

A key to devining possible locations for Long-eared Owls involves suitable hunting habitat. They hunt over open and semi-open ground, and if an area has Short-eared Owls and Northern Harriers, there is a good chance that Long-eareds are also in the immediate vicinity. The latter are strictly nocturnal, though, and thus much harder to discover. It involves lots of peeking and peering into dense vegetation, and/or much luck.

I want to thank Jeff Finn for pointing these birds out to us, and taking us to the spot. It's an interesting story as to how they were discovered, which was quite serendipitous. The location cannot be divulged, though, as the owls are on lands that are not publicly accessible, and I am always loathe to reveal Long-eared Owl roost sites as human pressure can become heavy once they're known. But now that we've seen these deciduous willow-roosting birds, we have a good search image for a "new" habitat in which to seek owls.

Monday, January 16, 2012

Long-eared Owl

Excellent habitat for wintering Long-eared Owls, Asio otus: dense roosting cover bordering a large expanse of old meadows. Long-eareds hunt in much the same habitat as does the closely related Short-eared Owl, Asio flammeus, but unlike its stubby-eared brethren, Long-ears are strictly nocturnal.

Bill Lindauer, an Ohio Certified Volunteer Naturalist, found a Long-eared Owl roosting in one of those red cedar trees buffering the meadow's edge in the above photo. I met up with Bill and his fellow OCVN'ers Dave Woehr and Nina Harfmann this morning to take a gander at the owl.

Long-eared Owls are secretive in the extreme, and are very good at hiding themselves in thick cover during the day. They do not like to be disturbed. Oftentimes if you find one, there'll be more - Long-eared Owls are frequent communal roosters and I have seen up to 20 in one tree before. This bird is apparently a loner, but this site, on the edge of the sprawling Caesar Creek State Park, contains an abundance of suitable habitat. You can bet there are probably other Long-eared Owls in the area.

We had a distinct advantage in that Bill knew exactly which cedar the owl was roosting in. We cautiously advanced, and spotted the white-washed branch, above, from a good 75 feet away. A quick scan with the binocs revealed the owl - producer of the guano - sitting a few feet higher in the tree.

Spotting the big-eared beast so far away was good, as we didn't have to approach so closely as to impinge on the owl's comfort zone. This photo was taken with my 300 mm lens, and cropped. It's no award winner, but shows the animal well enough. As is so often the case when word gets out about roosting Long-eared Owls, there was a well trampled trail leading directly to the base of the cedar tree. Fawning admirers standing at the base of the tree would be within 15 feet of the roosting owl, and that's too close.

A very good strategy for observing roosting Long-eared Owls, once their roost tree is known, is to carefully search for gaps in the foliage from a long ways back. That's what we did, and by sidling back and forth in the meadow we eventually discovered an opening in the cedar - like a little window to the owl. We could then set up my scope and beam right in on the bird, and although we were at least 75 feet away, our views were probably better than one would have by standing under the tree and looking up at the nervous owl.

Another benefit to the observer of remaining well outside the owl's comfort zone is that it will act naturally. If you are looking at a roosting Long-eared Owl and it is rigidly upright, body sleeked to impossibly thin dimensions and looking all the world like a broken snag, it is because the bird is on high alert. You've spooked it. Its next course of action would be to flush, and that's a bad deal for one of these highly nocturnal creatures. If a sharp-eyed crow or other songbirds spot it flying off, the poor owl is in for a lengthy torment, and its persecutors will probably summon all their buddies to join in. Worse yet, the owl becomes exposed to other predators, mainly larger birds of prey, who might wish to make a snack of it.

So, we were able to leisurely admire the Long-eared Owl through the scope as it sat fat, fluffed and droopy-eyed. It paid us no mind, and we could ooh and aah over its jumbo ear tufts, burnt-orange facial discs, and cryptic coloration. At one point a nearby Blue Jay let loose with a scream, and the owl snapped to full alert. I'd rather have the jay annoy the owl than us.

I think much consideration should be taken when deciding to report roosting Long-eared Owls. Revealing their location far and wide, such as through bird listservs, is sure to cause a stampede to the site. That's understandable, as Long-eared Owls are hard to find and quite charismatic. I personally want every person on earth to see one, as a personal experience with such a bird may well win converts to birds and conservation.

On the other hand, the owls' welfare comes first. If it appears that the owls are in a situation where excessive visitation may cause the birds problems, it may be better to keep them under your hat and not reveal their whereabouts. But in some situations, such as the one featured here, it is possible to have your cake and eat it too, so to speak. It takes a bit more time and effort, and a spotting scope, but distant views can be every bit as rewarding as getting right up in the owl's face.