(: the best of :) THURSDAY: The “Land Shark,” The “Land Catfish” & The “Land Octopus”

31 October 2013

Decades ago, the film, Jaws, was credited with terrifying movie goers to the point that they avoided beaches for fear of being attacked by a real version of the film’s animatronic great white shark. [image] [1] Then, there was a sequel with promotional trailers warning:  “Just when you thought it was safe to go back in the water.” [image] But at least you were safe on dry land.  Right?

Saturday Night Live’s writers decided to take away that last refuge of safety by presenting a predator that could strike on land or sea.  In 1975, the first in a series of SNL sketches featured a hapless urban dweller who hears a knock on their front door.  When the caller is asked to identify themselves, a voice on the other side of door says “repair man” or “door-to-door salesman.”  Then, when the door is opened, in plunges the “Land Shark” (or a giant foam rubber version of the “Land Shark”), which completely consumes the victim. [2] [image] [video]

Well, the Land Shark was just a joke.  Wasn’t it?

It was.  But, like more than a few fictional, on-screen characters, the Land Shark seems to have an imitator.

Just when you thought it was safe to go near the water?

Catfish in France have learned to hunt pigeons. [3] [4] Fishermen on the France’s River Tarn were more than shocked to witness catfish “loitering in shallow water near sandbars populated by pigeons.”  When one of the birds wandered too near the water line, it was a “Land Shark” experience for the bird and a meal for the catfish. [video]

When Julien Cucherousset of Paul Sabatier University heard the story from the bewildered fisherman, he captured footage of the “event.”   The on-line video went viral. The first time I saw the video, my reaction was almost that of an academic naturalist.  “How fascinating,” I thought.

At least, I thought it was fascinating until I learned that these catfish were three to four feet long.  So, I am only about 2 feet longer that the largest of these “Land Catfish.”  My next thought?  Would I . . . ?  Yes, I assured myself.   I’d win — if caught in a shoreline struggle with an overly aggressive four-foot catfish.  Then, I reflected.  Suppose I was sick and weak that day?  I didn’t try to answer that question.  I just . . .  thought of something else.  [5]

At first, I was comforted by the fact that this particular species of catfish wasn’t native to France, but had been introduced to the Tarn River about 30 years ago.  I imagined some weird, predacious species of catfish from the depths of the Amazonian jungle had been imported and accidentally released into the river.  But, when the full story unfolded, it turned out that these were just plain old catfish.  And they had been intentionally released into the river. [6]

Over the last three decades, the waters of the Tarn became less populated with crayfish and other smaller fish.  So, the catfish began feeding on land prey — a behavior no member of its species is known to have engaged in before.  These fish hover under the water near the shore watching their prospective, terrestrial prey.  Then, when an opportune moment presents itself, they leap out of the water onto the dry land, grab their prey, and leap back into the water taking there land-dwelling victim with them.  Then, the “Land Catfish” enjoys a leisurely meal in its underwater home. [7]

Autopsies of the catfish in the area revealed that not all of the fish were eating pigeons.  However, those that were tended to abandon their old diet of crayfish and other small fish focusing more exclusively on land prey.  [8]

Somehow, I found the casual way in which these animals extended their hunting range disconcerting.   But more disturbing was the autopsy’s suggestion that some fish had developed a taste for land animals — ignoring their old fare of crayfish and other small fish to focus almost entirely on pigeons.  As a land-based mammal who enjoys strolling along the shores of natural bodies of water, I’m still not entirely comfortable with these developments.

One writer, attempting to minimize the strangeness of it all, noted that African crocodiles jump out of the water and grab zebras.   And whales beach themselves on the ice to nab penguins for dinner.  But these are hardly apt comparisons.  Crocks and alligators are air-breathing lizards.  They just hang-out in the water.  Whales are also air-breathing mammals who have adopted a fish-like lifestyle. [9]

Neither of these examples could compare to a plain old fish intentionally jumping out of the water to grab some terrestrial creature, drag it into the water, and eat it.  I’ve watched scenes like this in old horror movies.  I’ve always loved to stroll along the shore of almost any waterway, but is it safe?  Where I live, my favorite body of water is the Mississippi River.  After seeing this video, I checked.  The Mississippi is teaming with catfish – those same enterprising, opportunistic, and hungry sea-beasts that are scarfing down pigeons in France!

On calmer reflection, I realized that the Land Catfish is actually engaged in the mirror image of human sea diving.  Somehow, I’d always thought that land creatures dived into the water to feed on unsuspecting sea creatures.  Not the other way around.  And human beings had the distinction of being the only creature that could learn to dive into the water for food (and maybe a few pearls).  Now, the Land Catfish has turned the tables on us.

But the Land Catfish isn’t the only sea creature that feels free to promenade out onto the dry land to pick up a meal.

A few decades ago, I remember strolling along a Sarasota beach at midnight — my feet kicking through the white sand.  In those distant days, you could still find yourself quite alone on the beach at night.  Absolutely taken with the beauty of the Gulf, I remember thinking how nice it would be to just stretch out on the sand and sleep in the cool breeze off the water until sunrise.

All those years ago, I would still have been quite safe from human interference, but I would never have thought of the possibility of something coming up out of the sea.  I can imagine the psychological trauma I would have experienced if, in the middle of that peaceful night’s sleep, I had stirred awake and opened my eyes to see an eye looking back at me:  the “dominant eye” of a local octopus.  The creature wouldn’t have been interested in me. It would have just been “passing by.”  But, after an experience like that, I would have moved to the top of a mountain — as far away from the water’s edge as I could get.

Not long after I saw the “Land Catfish” video, a story broke about a “Land Octopus.”  The terrestrial excursions of the octopuses have stayed pretty much out of the public eye until recently when one of these strange creatures was caught in the act – on video. [video]  An octopus was seen grabbing lunch, not while roaming where it belongs – underwater — but, instead, crawling around on the beach casually grabbing a few snacks.  The witnesses got a video camera and the rest is internet history.  [10]

How long has this sort of thing been going on, I wondered?  Well, octopuses have been doing this since . . . forever.

The Land Octopus starring in the San Mateo County, California video was not engaged in any particularly unusual behavior.  Marine biologist James Wood explained that several species of octopuses make brief forays onto land for a meal. [11]  Most discomforting was his explanation of why the public is so ignorant of this particular octopus behavior.  Octopuses leave the water all the time.  They just do it when they won’t be seen.  Wood explained that most octopuses are nocturnal, sneaking out of the water at night to enjoy their meals unobserved. [12]  Well, with this factoid, my nocturnal seashore walks are over.

The octopus caught on video was probably engaged in the octopus version of grocery shopping.  Julian Finn, a senior curator of marine invertebrates at the Museum Victoria in Australia explained that octopuses frequently emerge and hunt in tidal pools when the tidal waters recede.  The octopus examines these “grocery shelves” either with its eyes, (octopuses have rather good vision), or feel for food with its outstretched arms (tentacles?). [13]

However, not so typically, the cephalopod shopper in this video is seen discarding an empty crab shell during its shopping spree — after eating the occupant.  Either this octopus was particularly hungry and couldn’t wait to get home, with the crab serving as a kind of fast food snack or, even with eight arms, carrying all those groceries got to be too taxing.  If the “groceries” get too heavy, octopuses often stop and eat their way to a lighter load. [14]

However, shopping isn’t the only thing that brings octopuses out of the water and onto dry land.  Finn explained that octopuses also “lurch” out of the water onto land to escape danger.  Wood recalled an incident in which he was chasing and photographing a common octopus “when it crawled out of the water, across eight feet of rocks and went back into the water” apparently hoping this maneuver would confuse the pursuing photographer. [15]

Mercifully, octopuses aren’t interested in eating people.  Hostile interactions between octopuses and people happen when the octopus perceives a person as a threat rather than as a potential meal.

Still, even if I’m not on the menu, I wouldn’t like to encounter an octopus as I was strolling or resting on dry land.  Imagine if I’d paused to catch my breath on that eight foot expanse of rocks when the Land Octopus jumped out of the water in its attempt to shake the pursuing James Wood.  After literally running into an octopus on dry land, you can bet that it would be a long time before I thought it was safe to go anywhere near the water.

Of interest:

Land Shark (Saturday Night Live)

SoundEagle in Debating Animal Artistry and Musicality
































THURSDAY: Bees – Little Robots or Thinking Beings?

16 January 2014

Could bees be more intelligent than we think?  We’ve been hearing about a lot discoveries in the area of animal intelligence.  It’s one thing to speculate about the intelligence of birds and even octopuses, but insects?

Well, at least one group of scientists has tried to “look into” the question.  I say “look into” because, with insects, it’s difficult to come up with anything even remotely resembling a standardized test.  So, the researchers began by biting off a piece that scientific testing “could chew”: Do bees have individual personalities?

A research team at the Queen Mary University of London designed an experiment in which they observed the foraging preferences of bumblebees.  However, the experiment was not designed to test the general foraging preferences of the bees, as a group, but the individual preferences of the individual bees.   In other words, let’s look past the swarm and ask: what’s on the mind of the lone bee in the crowd?

The team of researchers, Helene Muller, Heiko Grossmann, and Lars Chittka, released bumblebees into an enclosed space with artificial flowers of different colors.  The idea was to see if individual bees had their own individual favorite colors.  Do some bees prefer one color while some of their peers prefer other colors?   The researchers measured how quickly individual bees approached flowers of a certain color, and how long individual bees stayed at flowers of a certain color.

In a paper published in Animal Behavior, the team reported finding no difference among the individual bees’ observed “preferences.”  The result suggests that bumblebees do not have individual personalities.   Of course, this doesn’t end the investigation.  There may be future studies with other tests based on other criteria.  But, for now, if you’re in advertising and bumblebees compose your target market, it makes no difference what colors your product comes in.

One interesting aspect of the experiment or, perhaps, interesting aspect of bee species, themselves, is the difference between the hive-less loner — the bumblebee – and its more social cousin — the honeybee.  All bees are social, but bumblebees live in relatively small groups in nests that are abandoned and rebuilt on a yearly basis.  These bees tend to forage for food alone.  In contrast, honeybees live in densely populated hives, which will remain their home from birth to death.  Honeybees travel and forage for food in swarms.

What difference does sociability make?  Well, maybe none.  However, the development of human intelligence has long been attributed to the necessity for social interaction.  In other words, because humans developed social groups in order to survive, they were compelled to develop intelligence in order to interact with other members of the group.

If the relationship between intelligence and social interaction were the rule, the bumblebee subjects of this latest study would be the “less intelligent” species when compared to their more social cousins, the honeybees.  So, maybe the colored flower test should be performed on the honeybees because these bees are more social.  That means they must be more intelligent.  Right?  Well, maybe it’s not that simple.

Perhaps, human intelligence did develop in response to social interaction with the result that human researchers assume that this is the only way intelligence could develop.  The social interaction “rule” has been seriously challenged by the high levels of intelligence displayed by one of the most unsocial animals on earth: the octopus.

Octopuses have virtually no social interactions with members of their own species.  These creatures, literally, meet their peers only briefly to eat them or mate with them.  Both process result in the death of either one or both of the guests at the party.  (With octopuses, mating is followed by the swift death of both participants.)  That’s the social life of the octopus.  Period.

Perhaps, just because human intelligence developed out of the necessity for social interaction, human researchers have a built-in prejudice in favor of social intelligence.  And, perhaps, it was just this prejudice that blinded human researchers to the clear displays of octopus intelligence – at least until relatively recently.  What got the unsocial octopus noticed?  Its use of tools.  The octopus displays an amazing repertoire of tool selection, retention, and use and, also, displays a remarkable ingenuity in its interactions with its inanimate environment.  So, social intelligence certainly isn’t the only type of intelligence.

See: “THURSDAY: A Different Flavor – Just How Smart Are Octopuses?

Given the amazing intelligence of the loner octopus, perhaps, the more intelligent bee species would be the (relatively) lone bumblebee.  Forced to develop its individual initiative through ages of lone foraging, perhaps, the bumblebee has developed a resourceful intelligence.   But is intelligence the same as personality?

While no one knows the answer to these interesting questions, the “The Best Bees Company” added some interesting suggestions based on their own interactions with bees and bee keepers.

In their experience, different hives seemed to have different “personalities.”  The honeybees of one hive “hoarded” pollen – gathering and storing it in large quantities.  But the bees of another hive seemed to prefer gathering and storing more honey in preference to pollen.  While noting that these and other differences could be attributable to different environments, or even genetics, the authors make an interesting suggestion with a question.

Could individual hives, rather than individual bees, develop personalities?  As the authors put it, could there be a “personality” distinct to each hive’s “social super organism?”  From yet another angle, could the “whole” be more than the sum of the “parts.”  That is, could the “whole,” hives and swarms, consistently develop and display particular behavior patterns distinct from other hives and swarms.  In contrast, the “parts” alone, the individual bees, display no apparent individual behaviors?

See: “Individual personality in bees? Animal consciousness? Cool research.

Well, all of these are interesting questions.   Experienced observation together with the earliest research predictably seems to provide many more questions than answers.  At this point, the puzzle boils down to whether or not bees (and all insects) are, intellectually, “little robots” or “thinking beings.”


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