When your rooster crows at the break of dawn
Look out your window and I’ll be gone
You’re the reason I’m trav’lin’ on
Don’t think twice, it’s all right
"Don't Think Twice, It's All Right - Bob Dylan
It is a warm and humid morning in mid-August and not yet light. Wakefulness is coming to me this morning before the sun, and I open my eyes to look around the room, lit only by alarm clock glow. A slight breeze blows through the open windows and all is quiet. The nights sounds of owls and coyotes have ceased and the birds have not yet started their songs of daybreak.
Then I hear the first morning sound floating up
the hill, “Err-err-eeeeeerrrrr!”
Emile is awake. “Err-err-eeeerrrrr!” In a bit Emile’s call is joined by another
one, a bit flatter and raspier, “Err-err-Rup!
Err-err-Rup!” Snowball has added
his morning commentary. This duet continues for a while and then is joined by
another voice, more shrill and abrupt, “Errrrr-errrrrr!” Now Paul is chiming in. I swing my legs over the side of the bed and
start my day—the sun is just beginning to lighten the eastern horizon.
By the time I get to the coop, the sun is peaking
over the eastern edge of the world. Some
of the hens are off the roost and scratching around the coop. The boys are all still on the roost and are
continuing their song. I open the coop
doors and everybody hurries outside, and the roosters carry their message to
the great, wide world.
Everybody knows that roosters crow in the
morning and most people also realize that roosters also crow other times during
the day. But not very many people wonder
why. What is their motivation? Here’s the good news: There are real scientists out there who wonder why
roosters crow. They think about that as
well as other chicken behavior and study chickens in controlled scientific
experiments. One such scientist is Tsuyoshi
Shimmura at Nagoya University in Japan.
Dr. Shimmura and his colleagues have tackled interesting topics such as “Do
chickens raised by a broody hen behave differently than chickens raised without
a mom?” (Short answer: “Yes!”) and “Do chickens in small cages peck more
than free-range chickens?” (Long answer:
The amount of “beak related activity” (e.g. grazing, eating, drinking, preening, aggressive pecking, gentle
feather pecking, severe feather pecking, litter pecking, and object pecking)
stayed about the same regardless of how chickens were housed, but which type of beak related activity is
influenced by their housing).
So, what about crowing? It turns out that “Err err errrrrr” means a
bunch of different things in rooster lingo.
(And let’s face reality! “Err err
errrrr” is what roosters really say. Has
anybody, anywhere, ever heard a
rooster say, “Cock-a-doodle-doo? Come on,
people!) According to Dr. Shimmura,
Emile’s “Err err errrrr” can mean any of the following:
Territory: “Good
morning, everybody! I’m Emile, you are
my flock, and I’m in charge!”
Warning: “Here comes Randy with the scary garden
cart! Have no fear girls! Gather round and I shall protect you!”
Pecking Order: “Hey, Paul, little
buddy! You stay in line, or you’ll feel
the wrath of my spurs, Okay?” And,
Snowball? Just sayin’, you’re lucky
there’s a fence between us!”
Food Availability: “Look,
everybody! Here’s Randy with the bucket
of scratch grain! Feel free to thank me
now!”
In other words, roosters crow for pretty much
any reason imaginable. But they do seem
to crow more in the morning. Scientists always assumed that the rising sun
somehow stimulated roosters to crow. But
there are a lot of people who have spent time around chickens and are aware
that roosters usually crow before
dawn. So what’s up with that? Are roosters responding to the increased
levels of light, or do they have some sort of internal biological clock?
To find out, the Nagoya University scientists put
roosters in an artificially lighted environment that was light for twelve hours
and dark for twelve hours each day. As I
could have predicted, the roosters started crowing two hours before the lights switched on each day. The timing of their morning crowing was
regulated by their own biorhythms! To
further confirm the presence of internal biological clocks, the researchers put
roosters into a completely dark environment for a period of days. They soon settled into a pattern of a 23.8-hour-day—and
would crow at exactly the same time each day on that cycle. When the roosters were subjected to scary
lights and sounds, they did respond to them by crowing, but they would always
crow more if these stimuli were presented at their “dawn”. The researchers concluded that “internal clocks take precedence over
external cues.”
In another study, Dr. Shimmura’s team
determined the pecking order in a group of roosters and then observed the order
of their crowing. Consistently, the
dominant rooster would start crowing shortly before dawn. Then and only then, the second ranked rooster
would crow. After he crowed, the third
ranked rooster would crow, and like dominoes the other subordinate roosters
would commence crowing, one after the other in descending order of rank. When the dominant rooster was removed, the
second-ranked rooster jumped right in and started crowing before dawn to start
the cascade of the subordinate rooster crowing.
So now we know!
Isn’t science great?! Next, I’m
hoping this group of scientists will get to work solving that age-old
conundrum: “Why did the chicken cross
the road?”
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