What is that hooting? Is it an owl calling in the middle of the day?
In the spring, male mourning doves (Zenaida macroura) perch high, puff their throats and make the deepest loudest sound possible for a bird so small. The first rising note is lost in the distance, but the last two or three low notes carry far.
Last week at Moraine State Park I was momentarily transfixed when I heard “Hoooo Hoooo” across the valley. When I paused to listen I realized that the cadence didn’t match any local owl. Not the great horned owl. Not the barred owl. I heard only two notes but they were spaced like the mourning dove’s.
Listen as a mourning dove sings one rising note, then 3 or 2 low notes. Imagine you can hear only the last two notes. (Xeno-canto recording XC153652 by Paul Marvin at Moosehead NWR, Maine)
Now compare it to these two owls:
GREAT HORNED OWL recording by Ted Floyd, Boulder, CO at Xeno-canto XC344952
BARRED OWL recording by Tim Spahr, Ithaca, NY at Xeno-canto XC25239
White-tailed ptarmigans (Lagopus leucura) hide in plain sight by blending into the landscape. They’re speckled brown in summer and white as snow in winter. They virtually disappear when they close their eyes.
In late November Dan Arndt found these birds in the snow at Highwood Pass, Highway 40 in Alberta, Canada.
How many ptarmigans do you see?
Willow ptarmigans hide, too. Practice finding them in this 2010 article: Where’s Willow?
Birds use alarm calls to warn each other of danger but pigeons are generally silent. What sound could a pigeon make to signal danger? The crested pigeon (Ocyphaps lophotes) of Australia uses his 8th feather.
Crested pigeons make a whistling sound when they fly — a high note on the down stroke, a low note going up. Researchers found out that the eighth primary feather is the source of the high note and that the speed of the low-high modulation provides the warning.
When a bird flaps slowly the whistle repeats slowly, so other pigeons decide the bird is not afraid. When the sound repeats rapidly it sounds like the pigeon is fleeing, so the other birds do, too.
The two wild turkeys at top are displaying to females. Which one has the best snood? I can’t tell but the females can. Click here to see how the ladies reacted.
(photo credits: two wild turkeys by Cris Hamilton; women wearing snoods from Wikimedia Commons; man wearing a beard snood from sales page at Creeds UK; wild turkey diagram from Wikimedia Commons. click on the images to see the originals)
A new DNA study of the passenger pigeon brings up an interesting question: Could we bring the species back from extinction?
Genetic engineering now makes it possible to transfer genes across species boundaries. Using these techniques a group named Revive and Restore is working to modify the genes of the passenger pigeon’s closest living relative, the band-tailed pigeon (Patagioenas fasciata), to make a new bird that resembles a passenger pigeon.
If successful, they’ll release the new bird in the wild to repopulate eastern North America.
But a new study published this month in Science may throw a wrench in their plan.
Researchers gathered DNA from the toepads of passenger pigeon museum specimens and sequenced the full genomes of four birds. In doing so they discovered that passenger pigeons were extremely diverse at the ends of their chromosomes but had low diversity in the middle. Most animals, including the band-tailed pigeon, aren’t like that. Most animals are diverse all the way through.
This trait may indicate that the passenger pigeon in its final form had evolved to live in enormous flocks.
So, why did this superspecies die out? Shapiro thinks it’s because the bird specifically evolved to live in mega-flocks, and developed adaptations that became costly when their numbers suddenly shrank at human hands. “Maybe they were simply not adapted to being in a small population, and didn’t have time to recover,” she says. Maybe they hit a tipping point when there were just too few of them to survive, regardless of whether they were being hunted.
Would a small population of passenger pigeons be possible in the wild? And could the birds survive in this century’s altered and deforested landscape? Revive and Restore believes the answer is yes.
Can humans bring back the passenger pigeon? Should we try?
(photo credits: Passenger pigeon specimens at Carnegie Museum of Natural History by Kate St. John. Band-tailed pigeon from Wikimedia Commons; click on the image to see the original)
On Labor Day let’s take a look at some working birds.
Chickens were first domesticated about 9,000 years ago in both China and India but the idea didn’t really take off for another 2,000 to 4,000 years. Then it spread slowly westward to Persia (Iran), Egypt, Europe and Africa. Chickens are now the most numerous bird species on Earth because humans like to eat them and their eggs.
Because of our close relationship to chickens we tend to forget that they are birds and we can learn from their behavior.
What does a hen do when she wants to lay an egg? This video answers the question among a flock of free range chickens.