Osprey Nesting Platform Install

Osprey In Flight

The Osprey (Pandion haliaetus) at Anderson River Park in Shasta County have been nesting atop a soccer field light stand for over 17 years. The problem is that they build the nest right on top of the field lights. This becomes an issue when, every four or five years the light bulbs need to be replaced and the nest can be destroyed in the process.

Osprey Nest

One of my wildlife rehabber friends had received a legacy gift and contacted me regarding the prospect of building a nesting platform to place at the top of the utility pole. This would allow the Osprey to safely nest above the bank of lights, thereby keeping their nest intact year after year, with no interference from the maintenance crew.

I, of course said, “what a great idea!” I found an excellent plan for the platform (shown below) from the International Osprey Foundation and built it in less than a day. It is a 40 x 40 inch box which I modified using all 2 x 6 inch pressure treated lumber.

Osprey Nesting Platform

Before building the platform I contacted the Anderson City Public Works department to discuss the possibility of actually putting up the platform and got the OK. We obviously wanted to get it up before the Osprey arrived and were able to install it on January 31st.

Osprey Platform Lift

This is an 86 foot utility pole so a lift was rented and the excellent workers from the City of Anderson Public Works department generously gave their time and expertise to the project.

Having never seen an Osprey nest close up, I asked one of the installers to take some photos of the nest before removing it and placing the nesting material in a bin to be put back into the new platform.

Osprey Nest

The shape of the Osprey nest changes during the breeding cycle. During incubation the nest is distinctly bowl-shaped. After hatching the nest flattens out, but a rim of sticks is maintained, sometimes by the young themselves, while the young are beginning to move clumsily about the nest. In the last weeks of the nestling phase, the nest often becomes completely flat1. Note the large sticks and bark.

Osprey Nest

Here’s a shot of one of the installers placing the nesting material back into the newly installed nesting platform.

Osprey Nesting Material

About four weeks after the install I went back to the park to see if Osprey had shown up. I found one bird perched inside the platform!

Osprey In Nest

However, there were also a pair of very vocal Red-Shouldered Hawks (Buteo lineatusin) in a nearby tree.

Red-shouldered Hawk Pair

Apparently they were interested, for whatever reason, in the nesting platform as well.

Red-shouldered Hawk

A week later when I returned, the platform was now occupied by a pair of Osprey!

Osprey Pair

I observed them for over an hour but never saw them bring in nesting material, although there is obviously new sticks in the nest. The Red-shouldered Hawks were still hanging around but this day, the Osprey pair were involved in mating and the hawks were vigorously chased away by the male Osprey.

Osprey Copulation

Osprey pairs copulate frequently, on average 160 times per clutch, but only 39% of these result in cloacal contact. Pairs average 59 successful copulations per clutch, starting 14 days before, and peaking a few days before, the start of egg-laying1.

Osprey Copulation

Pairs copulate most often in early morning, at the same time as egg-laying1.

Osprey Copulation

As I returned a couple of weeks later, the first thing I noticed is that there has been much more nesting material placed into the platform and the male was bringing in more and arranging the sticks.

Osprey Building Nest

After trimming and arranging these large, long sticks, the male Osprey took off and the female did some rearranging.

The male soon returned to a nearby utility pole on the opposite side of the soccer field with a rather large, what looks like a trout.

Osprey With Fish

He ate about half of the fish, starting at the head, before carrying the remaining portion back to the platform to share with his mate.

Osprey With Fish

References: 1Birds of North America Online

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New Bluebird Trail Goes Up In Redding

Girl Scout Troop 70173

March 6th we were contacted by Heather McNeal, the leader of local Girl Scout Troop 71073, to help with creation of a new Western Bluebird Trail in the Redding area. Heather had already done the groundwork for the project and simply needed some help with the specifics of how to construct the nest boxes and where to place them. We were happy to help!

Girl Scouts Installing Bluebird Boxes

There are fifteen enthusiastic girls in troop 71073 and each girl, with a little help from some handy adults, put together fifteen quality nest boxes that were ready to install on Saint Patrick’s Day, March 17th.

When these girls found out that cavity nesting birds needed help, they were all in on putting up birdhouses on the Sacramento River Trail.

Girl Scouts Installing Bluebird Boxes

The troop did a great job installing the fifteen new nest boxes and will now begin monitoring the trail for nesting birds. We are excited about the addition of these birdhouses and the variety of species they will help. These nest boxes can be used by:

  • Western Bluebird
  • Oak Titmouse
  • Tree Swallow
  • Violet-green Swallow
  • White-breasted Nuthatch
  • Ash-throated Flycatcher
  • House Wren

Stay tuned for updates!

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Several Blue-winged Teal Were Seen at Gray Lodge Wildlife Area

Blue-winged Teal Drake

The Blue-winged Teal (Anas discors) is not that common in California except along the coast, so we were pretty excited to discover several pair at Gray Lodge Wildlife Area on Saturday. Click on photos for full sized images.

Blue-winged Teal Drake

Of course the drakes get all of the glory in the duck world but I think the females are just as beautiful in their own way with their heavily patterned feathers. This is the female Blue-winged Teal. Note the blue on the top of the beak.

Blue-Winged Teal Female

Blue-winged Teal breed over a large portion of North America but occur irregularly or at low densities in many portions of their range. The highest breeding densities occur in mixed-grass prairie and parklands of north-central U.S. and the prairie provinces of Canada, where the species is often the most abundant breeding duck1.

Blue-winged Teal Range Map

It was a gorgeous day at Gray Lodge Wildlife Area, even though it was pretty windy and fairly cold, the sun was out.

Blue-winged Teal Drake

And just so you know…

Blue-winged Teal Drake

these photos were all taken at Sacramento National Wildlife Refuge…

Blue-winged Teal Drake

from one of the photo blinds there…

Blue-winged Teal Drake

not at Gray Lodge Wildlife Area.

Blue-winged Teal Drake

Once every feather is clean and in place, it’s time to relax and enjoy a little shut eye.

Blue-winged Teal Drake

I was able to shoot some video of the Blue-winged Teal pair preening and foraging at Sacramento National Wildlife Refuge. A couple of Green-winged Teal drakes shared in the activity. You will also hear several Marsh Wrens in the background. They were seen and heard all over the refuge wherever bulrush was found.

This short video shows the head shaking behavior Blue-winged Teal exhibit just before they take flight when they feel uneasy or threatened. It also includes Black-necked Stilts, Green-winged Teal, and American Coots. You can also hear Red-winged Blackbirds, Western Meadowlark and more Marsh Wrens singing.

References:1Birds of North America Online

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Black Phoebes Make Doughty Neighbors

Black Phoebe

Black Phoebe photo courtesy of David Bogener

Winter is not traditionally mosquito-buzzing or cricket-singing season. The bugs lie low, not with summer music but tucked mutely into a puddle or under a log or leaf, usually as eggs or larvae or pupae. They wait for the revolving Earth to point us sunward, waking them up and rousing the crescendo of photosynthesis that prospers life seasonally all over the planet’s surface.

Songbirds, of course, know these seasons at an instinctual level. Our summer birds head south to sunnier latitudes not to keep warm but to keep in grub. Flycatchers, who snag six-legged prey right out of the air for breakfast, lunch, and dinner, are particularly reactive to insect dormancy. Customarily, they enjoy Acapulco or similar resort destinations this time of year.

But there’s always a nonconformist. Come drenching winter rains, pounding hail, hard frosts, and coats of snow, one little flycatcher finds a way to live through winter right here in Northern California. The black phoebe is one of our pluckiest neighbors.

Black Phoebe with Spider

They are no shrinking violets, nor much vegetative at all. Although scarcely the length of your handspan, and dressed in buttoned-down black-and-white, they engage life with redoubtable effervescence. They abundantly sing out their name, phoe-be, phoe-be! as if announcing nature’s vitality on even a frosty morning. They fly-catch when flies—or moths or mosquitoes—are few and far between, and expand their hunt to snatch prey from blades of grass or the surface of ponds. They flick their tails incessantly as if life simply requires dancing. They wear just a hint of a punk ‘do in their headfeathers, just enough to keep more sedate heads wondering.

And they not only survive, they flourish. When spring comes with readier food supplies, pairs reunite, and the male takes his mate on a tour of possible nest sites, fluttering enticingly under bridges or shady eves, or in the cleft of a tree-sized boulder. She chooses a spot and builds a nest, a half-bowl of mud plastered to the selected vertical surface—possibly refurbishing a site that the pair used in prior years.

Black Phoebe Nest

Phoebes defend their turf, chasing off other insectivores and reserving the local winged protein for themselves and their nestlings. But plucky is not foolhardy. They will generally flee a hunting hawk. Still, they are known to harass a fox or cat, and have been observed chasing jays thrice their size to protect their helpless young.

Black phoebes have done well with people. As long as water is nearby, with its provision of insects for eating and mud for nesting, human development has multiplied the vertical surfaces that make continuing life possible for this hardy neighbor of ours. Keep an eye and an ear out: there is likely a clear “phoe-be, phoe-be” near you!

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Christmas Bird Counts Create a History of Information

Black-throated Gray Warbler

Black-throated Gray Warbler

It’s a team sport. It’s parallel play. It’s research. It’s art. It’s an exercise in hope. It’s a long cold day outdoors!

The tradition of Christmas Bird Counts was begun by Frank Chapman in 1900. People often do things because they don’t know what else to do, and Chapman wanted to provide an alternative to the then-popular Side Hunts—Christmas Day competitions to kill and gather the biggest pile of furred and feathered animals. It was the era when John Muir was chastising Teddy Roosevelt for expressing his love of animals by shooting them, and when the Audubon Society had recently formed to dissuade people from killing egrets so their plumes could adorn ladies’ hats. The Bird Counts quickly caught on.

From that first rudimentary count in 1900, in which 25 areas from Massachusetts to Pacific Grove, CA were surveyed by 27 people to tally a total of 90 species, the annual count has grown into a massive inventory of Western Hemisphere birds. Some 75,000 people now identify and count all the birds they can in over 2500 established circles. The circles are 15 miles in diameter. The counts are held between December 14 and January 5. Good-weather years can yield 60 million birds in over 2600 species.

Locally, bird watchers conduct four Counts. The oldest, the Redding Count, was begun in 1975. It extends from Shasta College through most of Whiskeytown Lake, and from Shasta Dam down to South Bonnyview Road. Up the road, the Fall River Count was established in 1984, and is always popular as a location where valley, mountain, and Great Basin species can be found in its open fields and abundant waterways. South of Redding, the Anderson and Red Bluff Counts abut each other where the temperate Central Valley provides winter homes to numerous songbirds and waterfowl.

Together, the four counts this year hosted 81 people covering a total of 109 miles on foot, 939 miles by car, and 13 miles by kayak or canoe to tally 165 species and 75,712 individual birds.

There are always some rarities on the counts, but this year had many. In addition to a wayward swamp sparrow from the eastern US, and a handful of mute swans, who are elegant but destructively ravenous invasives, the rare birds mostly seem to reflect warm weather. Kayakers on Redding’s stretch of the Sacramento River found a black-throated gray warbler and a Hammond’s flycatcher, both of whom are expected to be sunning in Mexico this time of year. A boater in Fall River found a red-breasted merganser and a red-necked grebe, who usually winter in temperate coastal waters. A burrowing owl in Anderson, and Red Bluff’s sage thrasher and white pelican are all pushing their wintering range northward.

Perhaps the warm weather, holding some southland birds here, is also keeping many of our traditional birds away, farther north. Fall River compiler Bob Yutzy reports, “The numbers of most species were down.” Low numbers are repeated throughout the North State. Brooke McDonald’s report on the Anderson count includes “We had 18 Mallards, which is shockingly low. The average is 132 and the previous low was 81. We had 25 robins and the average is 201.”

From Red Bluff Michele Swartout reports, “We have had little precipitation so far this winter season, which meant very little to no water in our local ponds and wetlands. The lack of waterfowl, in both species and quantities was very obvious during this year’s count.”

Bill Oliver, compiler of the Redding count, sums up his findings: “The species total was a high average, but the number of [individuals] was below average, as it has been for the other local Counts.”

While the ecological disruptions of a warming climate cannot be welcome, we can hope that for now our missing North State birds are temporarily elsewhere, perhaps discovered in other counts. National Audubon is compiling the data and, if wet weather doesn’t bring the birds in sooner, will be able to let us know before long.

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