13 February 2014
Bees? Are they dancing or are they talking? Are
they talking or are they dancing? But wait! They’re doing both! . .
. at the same time! It’s called the waggle dance. It’s, at least,
one of the ways bees talk to each other. What is the dance like?
Well, it involves waggling. And, before the dance was understood to be a
kind of language, at least one person who saw it, Nicholas Unhoch, thought the
bees’ danced just for a good time — enjoying “jollity.” Then, Karl
von Frisch got the idea that the bees were talking with the waggle dance.
He was a patient man. He spent years observing and cataloging the
“language” of the dance.
The dance is called a “recruitment” dance because the
dancing bee is trying to get other bees in the hive to travel to a particular
location at which, the waggle-dancer promises, the bees will be rewarded with
loads of honey.
The dance language goes like this. Imagine one of
those old dance-step charts, showing footprints, which would be put on the
floor to train would-be dancers. The bee-version would be tacked up on
the wall of the hive — actually, attached to the front of the honeycomb.
With bees, dancing is more of an “up and down” affair – unlike the human “back
and forth” dance movement.
On the chart, you’ll see one straight line up the center;
then, two lines curve out to the right and left at the top and,
then, bending down and back inward to reconnect to the bottom of the
straight center line. The bee dancer may follow this circuit more than 100
times.
The dancing bee follows that straight center line upward
from the bottom to the top waggling all the way. This is called the waggle
phase. Then, when the waggle-dancer reaches the top of the straight
center line, it stops waggling and goes to the right and back down to the
bottom of the center line. Then, it waggles its way back up to the top
and, turning left this time, stops waggling as it goes back down to the bottom
and repeats its climb to the top waggling all the way.
But what does the dance say? Well, first, it’s about
direction. If the bee waggle-dances absolutely straight up from bottom to
top, before turning left or right, it means that, when the recruited bees leave
the hive, they will find the honey by going in the exact direction of the sun
in the sky. If the “waggler” dances upward at even the slightest angle to
the right side or the left, that is the exact angle to the right or left of the
sun in the sky that the other bees must fly to find the honey.
Not only are waggle-dancing bees really good with angles,
but these bees know how the sun moves. Even if the bees linger in the
hive for a long time after seeing the dance, it won’t throw the waggle
dance directions off a bit. The bees will compensate for the
sun’s change of position by making the precise corrective adjustment necessary
to locate and, then, follow the correct direction.
But knowing the direction of the honey is only half of what
the recruited bees need to know. To find the honey, they also need to
know how far they’ll have to travel in that direction.. The distance is
just as precisely communicated by the waggle-dancer but, now, with
the timing of the waggling performance. The longer the waggle-dancer
takes to dance up the straight path from bottom to top, the farther away the
honey will be found.
There are many small variations in the waggle dancer’s moves
and each one means something. But the dancer isn’t a commander, but a
recruiter. So, the message in the waggle dance isn’t a command. The
waggler is just “selling” it’s find of honey to the other bees in the
hive. But if this is salesmanship, do the bees in the hive ever “pass” on
whatever the waggle- dancer is “pitching?”
Yes, just because a bee waggles doesn’t mean that the other
bees must follow. The first and greatest challenge is competition.
When I first heard this description of what happens in the hive, it reminded me
of a row of pitchmen at a circus or fair. There may be several, or
something like a row of, bees each doing its own waggle dance, at the same
time. Each hoping to recruit it’s fellows to the hoard of
honey that particular dancer has discovered.
As long as were discussing sales, you might wonder if there’s
an art to sales even among bees. Do some pitches work better than
others? Do some wagglers not just offer the steak, but “sell the
sizzle? (Better: Do some bees not just offer the honey,
but sell the sweetness?) But, even with bees, enthusiasm sells.
The more excited the bee is about the honey source, the more
rapidly it will waggle, communicating its excitement about its find to the
recruit-able bees in the audience.
Somehow, I can’t help imagining that I’ve seen this excited
waggle in other . . . creatures. When my dog hears the jangle of its
leash, he runs back and forth between where I’m standing and the door,
excited to be going outside. I think I’ve seen him
definitely waggling.
But back to bees.
There are “Do Bees” and “Don’t Bees.” Bad behavior
isn’t restricted to humans. Overly enthusiastic waggling bees
occasionally get out hand when it comes to sales. When competing with
their fellow wagglers, the dancers will, sometimes, disrupt their competitor’s
dance. Their competitor, in turn, will fight off the disruptor. I
can imagine the whole hive dissolving into the bee version of a barroom brawl.
But what about the potential recruits? Do they watch
dutifully to determine the best source and carefully note the direction and
distance to the honey. Surprising, like children in school, a few
do, but most don’t. Whether day-dreaming or quietly buzzing with their
friends about hive gossip, many miss the waggle message completely.
Then, what happens when these inattentive bees are jostled
from their distraction by the need to search for honey? Well, they may
lag, just a little, until the swarm forms. When it takes off to find the
next meal, these less informed bees will just follow along behind the swarm to
find the honey.
What happens if a bee lags even longer and misses
the direction of the departing swarm? Not to worry. Some bees
just fly out of the hive and look around on their own hoping to catch a lucky
break and find some honey by chance.
In spite of the “Don’t Bee” slackers, the waggle dance is
important to the survival of hives when honey is hard to find. When
supplies are short, the scouts who come back to the hive to waggle-dance are
the chief sources of information about honey location and, often, the only
available sources of honey for the hive. Only in good times can some bees
slack off and others go their own way when gathering honey.
After the swarm follows the waggler and gathers a lot of
honey, the bees will return to the hive loaded down. Then, the returning
bees pass their honey to receiver bees. The receivers, in turn, seal the
honey in the comb for storage.
But what happens if a swarm comes back loaded with honey to
find all the rest of the bees are leaving to gather yet more honey,
themselves? Well, the load-carrying bees have to stop the departing bees
from leaving because they are needed as “receivers.” How do the
loaded bees get the message across? Another dance. The “tremble
dance” is used to recruit receiver bees for unloading and storing the honey
brought back to the hive by bees carrying a full load.
And there are more dances. If a bee gets infested with
mites, or just covered with dust, it can do the “grooming dance.”
That dance recruits other bees to help the mite-infested or dusty bee
get rid of its mites or clean itself up.
M Grossmann of Hazelwood, Missouri & Belleville,
Illinois