Snowy Owls: Bird Expert Kenn Kaufman Answers 12 Questions

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Snowy Owls: Bird Expert Kenn Kaufman Answers 12 Questions

Find out if the birds are born white, why their vocalizations are different from other owls', and more.

By Kenn Kaufman
Published: 12/17/2013

The bird world is aflutter with news of snowy owls invading the Lower 48 and beyond. Here, Kenn Kaufman answers questions about the majestic birds posed by Facebook fans of Audubon and PBS Nature. Hungry for more on snowies? Check out PBS Nature's full film, Magic of the Snowy Owl, available for streaming here.

How many snowy owls are there?

Snowy owls nest all across the Arctic tundra of Alaska, Canada, Greenland, Scandinavia, and Russia. One careful estimate put their total world population at about 300,000. However, their numbers undoubtedly vary from year to year, rising and falling with changes in food supply and other factors, and they probably have declined overall in the last century.

Why do snowy owls stay in such wide open areas, and not among trees? Do they stay in open areas at night as well?

They're native to Arctic tundra, north of treeline, so for most of the year they wouldn't even see a tree. When some of them come farther south, they seek out areas that look similar to their Arctic territory: prairies, wide-open fields, beaches, lake edges. And yes, they stay in open areas at all times of day and night.

Are snowy owls born white?

Within a few hours after hatching, the young nestlings are covered with fluffy white down, but that is replaced by darker gray down within a few days. Their first set of feathers, which takes a while to grow in, is basically white, but with a variable amount of black spotting and barring.

How many eggs does an owl usually lay?

It varies among other species of owls. But that's one of the most fascinating things about Snowy Owls: the number of eggs that the females lay will change from year to year, depending on how much food is available. When food is scarce, they may lay only three to five eggs (or sometimes none at all). When food is abundant, as in a year when lemmings are in peak numbers, they may lay seven to eleven eggs, or even more. This is part of the reason why their numbers can increase so rapidly in a good season.

Why do snowy owls hunt for prey during daylight hours when other owls are almost strictly nocturnal?

Since most of their breeding range is above the Arctic Circle, they are in a regime of continuous daylight in summer, so they have to be able to hunt when it's light. During the winter, they may hunt either by day or by night, depending on local conditions and the type of prey that they're after. Often these wintering Snowy Owls will sit in one spot for most of the day, starting to become active near dusk, and doing much of their hunting at dusk or just after dark.

Why do snowy owls' vocalizations sound so different from those of other owls?

Most owls live in forest and are active at night, so communicating by voice is a very important part of their behavior. Since snowy owls live in open country, and they're active in daylight during the breeding season, they have less need for far-carrying sounds. Still, they do make hoarse hooting sounds as part of their territorial defense. They also make a variety of other sounds during interactions with their own kind, including shrieks, cackling barks, mewing cries, and snapping their bills shut loudly. Lone snowy owls on the wintering grounds are often silent.

What are some theories that explain the difference in the distribution of the November sightings this year (including Bermuda & Newfoundland) versus 2011?

This season's invasion so far has been concentrated farther east than the last one, along the Atlantic Coast and the eastern Great Lakes, with smaller numbers farther west. We don't have a complete answer for why this is happening. But we do know that lemmings (the owls' favorite prey in summer) were abundant in northern Quebec last summer, and the owls apparently had very good breeding success there. Elsewhere in the Arctic, including farther west, it wasn't such a productive season. So northern Quebec could be the source for much of this season's flight. From that region, if the birds headed south, they would wind up concentrated exactly where they are being seen this year.

We have had six or seven confirmed snowy owls in North Carolina this season. The last time one was here was in 2001. What are the reasons for these birds coming so far? Are these all young birds, or possibly birds that are returning from previous years coming more south than normal, expanding range? Also, is it true that this far out of historical range, many succumb to aspergillosis?

We don't know why the birds have come so far south. The most logical explanation is that in any big flight year, a few will go farther than the rest. Since the numbers involved in this season's flight are so large, several have gone farther south and have been detected. The great majority of the owls seen at southern latitudes this season have looked like young birds, heavily marked with black. And yes, snowy owls are known to be susceptible to aspergillosis. The spores that cause the infection are found worldwide, but the owls' immune systems apparently protect them from infection until they become highly stressed--and that may be more likely to happen with hungry young birds in unfamiliar surroundings.

How can we get people to leave the snowy owls alone?

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Kenn Kaufman

Type: Author | From: Audubon Magazine

Comments

Snowy owl witnessed by

Snowy owl witnessed by several in Williamsport, Pa early 24th FEB. It captured a large rabbit.

Yesterday there was a snowy

Yesterday there was a snowy owl spotted on the telephone pole in Watervill, New York.

I worked as a wildlife

I worked as a wildlife biologist for Michigan DNR in early 1970s. Was working with last flock, only remaining population, of greater prairie chickens in state; northen lower peninsula near Marion. MDNR owned and managed 320 acres of grassland that included the last booming grounds--where males/females gather each spring for breeding. Because of the open, prairie-like habitat, Snowy owls over-wintered there. The remaining population of prairie chickens totalled 32 birds; easily counted because they formed one flock in the winter. We worked with local farmers to leave corn standing over winter to augment their food supply. Because snowy owls hunt in daylight, we came to believe owl predation -- on the concentrated flock unaccustomed to daylight avian predation -- may have been a contributing factor in their final demise.

There have been a number of

There have been a number of Snowy Owls in the Washington, DC, metro area this winter. On February 5, I shot some video of one who was perched on a department store roof in Springfield, VA, about a dozen miles south of DC., and I posted it on YouTube. The link is at:
http://www.youtube.com/watch?v=jjBr1y6Su-g .

In 1952 while netting hawks

In 1952 while netting hawks for falconry along Lake Superior I saw what I thought was a white Gyrfalcon perched a distance away. When it seemed to take a long time coming to the lure I realized that it was an owl.
After netting it I put jesses on its legs and set it on a log. It did not appear stressed
Later, after feeding it, I stroked its breast first with a feather, then with my finger. It showed no nervousness nor hostility. I am sure that I was the first human it had seen.

I had the privilege of seeing

I had the privilege of seeing one of these beautiful birds last weekend at sitting on the dunes of West Dennis Beach in Dennis, Ma. I was very happy to see a large group of onlookers being very quiet and respectful while watching the owl...everyone's excitement was contagious!

I live in Sanilac County, MI

I live in Sanilac County, MI and ,two weeks ago tomorrow, I saw my first snowy owl while taking my dogs for a nightly drive. Since then I have repeated the same route every night and found that a pair of them are living in my area. I have seen them near each other twice but usually I spot the female within 100 yards of my house and the male about 3 1/2 miles northeast of my home near a barn. Being ignorant of snowy owls I was surprised to see them at all let alone in the daylight. When leaving with my dogs tonight at about 5:45 I looked across the road and noticed the female sitting in the top of a neighbors black walnut tree. Why do they seem so comfortable around people? I have been very close to take pictures, though I won't make it a habit, and the don't seem skittish. I will not approach them anymore but I wonder if they will stick around after they thin out the rabbit population.

There have been many

There have been many sightings at Presque Isle in Erie, PA. It's a wonderful place for them to visit!

Birds, i like this little

Birds, i like this little life. Interersting!

But you can see my page? if you like))

Essay Rider

I am astonished by reading

I am astonished by reading such a good article!. Great article Thank you for this

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