spite of a worldwide pandemic and all the associated changes to human life that
have gone with it, I’m happy to report that our Trumpeter Swans have kept calm
and carried on with normal swan life in the Blackfoot. Although we only had six pairs of swans
attempt to nest this year (following eight attempts in 2019), five of those
nests were successful, hatching a total of 20 cygnets. And all 20 cygnets survived to fledging
(flying) age! 100% fledging success is a
new record for us, and 20 cygnets is a healthy number.
Young swans released
released three yearling swans in June.
Yearlings we release have their flight feathers clipped short so that
they can’t fly immediately. This gives
them a chance to become bonded to the area where they are released. In mid-summer, all swans molt out all of
their flight feathers and grow new ones, leaving them unable to fly for a few
weeks. When the new feathers grow in,
the yearlings we release are able to fly like the other swans.
GPS collars and locations
We also put GPS radio collars on two adult (non-nesting) swans in the watershed. We were able to do this relatively easily during the swans’ flightless period in summer. At that time a few people in kayaks can paddle after a swan and corral it as it tires from swimming and lift it into a kayak. It’s a safe and relatively low-stress way to capture a huge bird! (Watch a video of it here!) The collars are extremely lightweight and we’ve seen no evidence that they hinder the swans. We check on those swans in the days after collaring to make sure there are no adverse effects.
we get a lot of helpful information from sightings of swans that we make and
that local observers send to us, being able to track the daily locations of
some birds adds a tremendous amount to our understanding of how swans use the
landscape. We have learned that they use
wetlands we didn’t know about or can’t get to easily, and that they move around
a lot during the summer. This helps us
know which areas and kinds of wetlands provide the best habitat for swans, and
can allow us to prioritize things like marking powerlines in places that they frequent.
Swan movements in the Blackfoot
map shows the locations and movements of one swan that we collared in July,
from the time we put the collar on until it flew south out of the Blackfoot in
October. Some of the blue squares
represent multiple days in one location.
We only actually saw and identified this swan by its collar four times
during the summer, but we now know where it spent every day. This will also help us know where to
concentrate our efforts to look for other swans, and get more accurate counts
of their population numbers.
Swan #10 left the Blackfoot on October 26, the weekend of our
early winter storm, and flew approximately 126 miles to Alder, MT. The Ruby River valley around Sheridan and
Alder is where many of the Blackfoot swans winter, and #10 has been in that
area ever since.
There are several folks in the Sheridan area who keep an eye out
for collars and leg bands on the many swans that winter there. A
yearling swan (1V8) that we released this June was observed near Sheridan, MT on
12/4. This photo was sent in an email
from the owner of Ranch Resources, a conservation ranching company in Sheridan,
who spotted 1V8 on a pond just outside of town, along with 20 other swans.
Another yearling that we released, 1V2, was also spotted near Sheridan on 12/22, very close to where Swan #10 is.
Our second GPS-collared swan left the Blackfoot on 11/14. She flew to Ennis Lake and spent two and a half weeks there, and on 12/1 flew to the Henry’s Fork of the Snake River, near Island Park in southeast Idaho, and she is still there.
Interested in supporting Trumpeter Swan recovery in the Blackfoot? Donate here.