Bee Intelligent

I remember a biology lesson when our schoolteacher laid out a row of pickled brains.  The lids of some jars were leaking formaldehyde vapor into the classroom, an irritating odor that I had to get used to after I started working along the corridor from the anatomy dissecting room at the Edinburgh Medical School.  But that day we only saw brains from a sheep, rabbit, dog, and mouse, and nothing as mesmerizing as a human brain or as minute as a bee’s.

Honey bee brain

Honey bee brain

The class was asked to place the brains in order from the smartest to the dumbest. Everyone voted for dogs at the top spot, even though their brains are only half the size of a sheep’s. Dogs are quick learners and can round up a stupid flock: it’s never the other way round!  Evidently a larger brain is not always gain.

One of my classmates piped up trying to impress our teacher, “Sir, isn’t intelligence hard to define and measure?”

“Not at all…”, he replied.

I can’t remember now the definition he gave except it was so anthropocentric I found it hard to relate to animals. And he believed the only reliable way to measure intelligence was using an I.Q. test. In those days, boys were still slightly in awe of teachers so no one dared ask the impertinent question: what does an I.Q. test for a Border Collie look like?

After graduating from high school, the boy who asked the question went on to a roaring success, as we expected, but not all the bright students who performed well in examinations in our boys’ school fared as well at college or afterwards. I wondered why. Now I know there’s more than one kind of intelligence – at least nine, so they say, but I shall add another. My classmate was right after all – intelligence isn’t simple, and sometimes “simple” is smart.

Our species doesn’t always get straight A’s in tests: sometimes animals are streaks ahead of us. Chimpanzees have better short-term memories for numbers and their positions on a screen test, and my Golden Retriever beats me in emotional intelligence (call it what you will). Like others of her kind she has an amazing ability to anticipate my actions even before they come into my mind, presumably having learned subtle cues of which I am unconscious before, say, taking her for a walk or feeding her. Owning a pet gave me more respect for animals than anything I ever learned in a biology class.

Bees too are intelligent – really? A honey bee “brain” is merely a string of ganglia containing fewer than a million nerve cells. The average canine brain contains thousands of times more cells. But many people claim that bees are intelligent, and as a new beekeeper they certainly fill me with awe. I wonder what my classmate would think now: would he say their nervous system is capable of anything more than instinctive behavior?

Routine inspection

Routine inspection

When a guard bee attacks my bee-suit like a kamikaze pilot while I am inspecting its hive, it is obeying an instinct that has been honed during millions of years of evolution. Since it didn’t have to learn this behavior I can’t call it “intelligent” any more than a military drone, except when there’s a human controller behind it. To call bees smart there must be evidence that they can learn from experience, and they can – collectively. They have a social intelligence based on the thousands of workers, a few hundred drones, and the single queen in a colony. I like to compare a colony with a body in which all the necessary functions for health and survival are divided between organs – brain, heart, liver, et cetera. In a hive or swarm, the responsibilities are split between guards, nurses, foragers, and an egg-layer.

If you watch an active hive you will soon be impressed by its orderly life, like a healthy body at work. Such smooth running requires a lot of communication through smell, touch, and sight, of which the most famous example is the waggle dance. Bees returning from foraging for food pass information to others by “dancing” for them, which is a kind of sign language conveying information about the direction, distance, and even the quality of a source of nectar or pollen.  This behavior increases foraging efficiency for the whole colony which would otherwise have to search randomly for food. And when bees go out again to forage a cognitive map in their tiny brain remembers where the good stuff can be found, and the best time of day to go. As impressed as I am with my smart phone, no manufactured mobile device I will ever own will be as clever.

The latest buzz is that bees can use the waggle dance as coded information to advise the colony where to relocate. When accommodation in a hive or a natural nest has been fully occupied the colony swarms to search for a new home, taking lots of honey with them. This is a beekeeper’s nightmare at this time of year after we recently celebrated the survival of our hives through the winter.

Checking for queen cells (peanut-shaped cells at base of frame) before "splitting" a hive to discourage  swarming

Checking for queen cells (peanut-shaped cells at base of frame) before “splitting” a hive to discourage swarming

Tom Seeley of Cornell University wondered how a swarm decides where to hive off to.  He chose for his study an island several miles offshore from Boston where there were no existing bee colonies or natural nest sites (no trees). His research team marked hundreds of bees with a colored ink spot on the thorax so the peregrinations of scouts from several swarms could be traced around the island. Then he set up hives, but some of them were much more hospitable sites than others.

Scout bees, being the oldest and “wisest” workers, searched for nest sites all over the island. When they returned they started dancing a coded message for the swarm, but how did it decide which scout had found the best home for them? The researchers noticed that the scouts that danced the longest were proposing the best quality nest sites, and they almost always rendered honest advice.  The colony reached its decision where to nest by vox populi or “interviewing” all the scouts: it seems an incredible blow to our pride that bees invented democracy millions of years ahead of us. The upshot of the study was that 19 times out of 20 they wisely chose the best site.

Swarm intelligence enables honey bees to make the life-or-death decision of finding a home that is safe from critters and the elements. So bees are bright. A swarm weighs about the same as a human brain, but humans can be rather lacking in collective intelligence, and often in trying to make a decision our judgment is poor and we create chaos and strife.

Next Post: Drive and Text, and Let Die

About Roger Gosden

British-born scientist specializing in human and animal reproduction & embryology. Academic career spanned from Cambridge and Edinburgh to McGill and Cornell's Weill Medical College in Manhattan where he was Professor & Research Director. Married to Lucinda Veeck Gosden, embryologist for the first successful IVF team in America, he retired early to Williamsburg, Virginia, to write and to recover from 'nature deficit disorder'
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3 Responses to Bee Intelligent

  1. Have you read “The Buzz about Bees: Biology of a Superorganism” by Jürgen Tautz? It was recommended to me by a bee keeper when I asked what I could read to find out a little more about bees. It is a great book with amazing photographs.

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