Winter birds seen and unseen
- Blog Post by: Jim Williams
- February 23, 2013 - 9:02 AM
The season for trips to find Pine Grosbeaks and Bohemian Waxwings seems to have pretty much ended. I track this through posts to the Minnesota birding email network run by the Minnesota Ornithologists; Union. Either the birds have moved back north or everyone who wanted to see them, and then posted results of their search, has done so. (Sometimes, if you search for birds to expand your list it becomes seen one, seem ‘em all, and travel slows.)
My guess is the birds are far fewer here right now. The winter finches that crowded our feeders each day for the past couple of months certainly are somewhere else. We had dozens of Common Redpolls and Pine Siskins mixed with our usual American Goldfinches and House Finches. I filled our feeders – eight tubes, one platform, and two on our patio door – twice a week. It’s been a week since I last did that, and all the feeders remain half full. A birder wrote recently on another email network, BirdChat, that finches move from place to place day to day. They are not feeder loyal. Ours have gone somewhere, no birds yet replacing them. We have a handful of goldfinches and House Finches, that’s all.
I hoped but didn’t believe that Bohemian Waxwings would make it as far south as the metro area. They didn’t as far as I know. Pine Grosbeaks mostly got no farther south than mid-state. A friend began a grosbeak/waxwing trek a few weeks ago, beginning in Chisago County and working his way west to Wadena and Todd counties. He keeps lists by county, and this being/having been an exceptional year for sightings of those species, off he went from his Rochester home. Lots of miles, yes, but he had a good time.
Friend Bob found them in Kanabec County, which is pretty close to us. I figured it was worth a chance and some driving. I headed north on Highway 169, skipping Elk River and Princeton as search sites, beginning a block-by-block canvas for ornamental crab apple trees in Milaca. Both the grosbeaks and the waxwings are most easily found in those trees, feeding on apples.
I found Pine Grosbeaks in Milaca, Garrison, and Aitkin. I found a pair of Bohemian Waxwings in Garrison. I took unsatisfactory photos of the waxwings. I had better luck with grosbeaks in Moose Lake on an earlier visit. The birds I photographed were females. Thinking back, I decided all the grosbeaks I had seen – two or three dozen – were females. I didn’t give that a thought until friend Betsy Beneke, naturalist at Sherburne National Wildlife Refuge, became curious about the same thing. She wrote the Cornell Lab of Ornithology, looking for an answer. She shared this with email list members.
Turns out it was likely I was seeing both females and males. I just couldn’t tell one from the other. The grosbeaks moving south tend to be almost exclusively females and first-year males. The latter look just like their moms. It’s assumed that each nesting pair of grosbeaks raise two viable young per year, the number needed to maintain a stable population. Assume one is male, the other female. Of the four birds in that family, only one looks like a male. If the pair has a very good nesting season and produces four surviving young, they and their mother look alike, and only one bird in six, the adult male, has male plumage.
Plus, the southern edge of any irruption – winter movement south – usually is dominated by young birds, all of which look female. Adults stay north, particularly adult males. This, said the folks at Cornell, is true of most species that occasionally move south, say into Minnesota in interesting numbers. It explains why most of the Snowy Owls found in Minnesota show the mottled black and white plumage of young birds. Rare is the sighting of a truly white, a snowy Snowy Owl. And so my photos prove.
One more brief owl note: Boreal Owls were being seen in unusual numbers in Duluth and north along Old Highway 61. One fellow saw seven in one day, which might be a record. He’s a professional bird guide. He called his day on the North Shore his best birding day ever. Boreals were easy to find. They were perched in trees along Highway 61 and other roads, visible without problem. I want to know how many Boreal Owls were not hunting along roadways. How many were back in the woods, off road, out of sight? When irruptions happen we see the obvious birds, those coincidentally where birders look (and few leave the road to tramp the woods). How many of these birds are really here?
Below, male and female goldfinches. The males, bright yellow and black in breeding season, show soft yellow in the winter. Some of them already have a yellow body feather or two as the spring molt begins. Females wear drab plumage throughout.
© 2013 Star Tribune