Science Beat: Round 2

Sometimes science just makes more sense with a beat. Last January, I shared with you some fantastic music videos on fish genetics, climate science, and sexual reproduction. Here are the competitors for Round 2:

The Periodic Table:

Cellular Respiration:

Skeletal Muscle:

Vote for your favorite in the comments section below and check out other sciency song battles at Science Song Playlist, The Science Life, Science Beat, Scientist Swagger and Battle of The Grad Programs! And if you feel so inspired, make a video of your own, upload it on YouTube and send me a link to include in a future battle!

The Mimic Octopus: Master of Disguise

The disguises of the mimic octopus: (a) shows a mimic
octopus looking out of its burrow; (b) is a foraging mimic
octopus with coloration to blend with the sand; (c) shows
a mimic octopus as a sole fish and (d) is an actual
sole fish; (e) shows a mimic octopus as a lion-fish and
(f) is an actual lion-fish; and (g) shows a mimic octopus
as a banded sea-snake and (h) is an actual banded
sea-snake. Images from the Norman, 2001 article
 in Proc. R. Soc. Lond. B.

Different animal species have evolved a number of ways to hide in their environments. One of the most popular tactics is by camouflage, often by matching the background or by having patterns that break up the animal's outline (think: zebras and leopards). Others have evolved to resemble other species that are generally toxic or venomous, in a technique called mimicry. But a few amazing species have been recently discovered to have the ability to alter their mimicry to actively imitate a range of species, depending on their circumstances. The most remarkable of these is the mimic octopus, which shifts its shape and behavior to mimic a number of different species as fluidly as a real-life Mystique from the X-Men.

This week at Accumulating Glitches I talk about the remarkable acts of mimicry by one of our planet's most fascinating species, the mimic octopus. Check it out here.

And to learn more, check these out:

1. Norman, M.D., Finn, J., & Tregenza, T. (2001). Dynamic mimicry in an Indo-Malayan octopus Proc. R. Soc. Lond. B,, 268, 1755-1758 DOI: 10.1098/rspb.2001.1708

2. Hanlon, R.T., Conroy, L., & Forsythe, J.W. (2008). Mimicry and foraging behaviour of two tropical sand-flat octopus species off North Sulawesi, Indonesia Biological Journal of the Linnean Society, 93, 23-38 DOI: 10.1111/j.1095-8312.2007.00948.x

Nature’s Halloween Costumes

Image by Steve at Wikimedia Commons.

It seems like everyone is racking their brains to come up with a great Halloween costume. But we’re not the only ones to disguise ourselves as something we’re not. Many animals put on costumes just like we do. Take this gharial crocodile for example (do you see him?), covering himself in parts of his environment to hide.

Other animals, like this tawny frogmouth below, develop physical appearances that help them blend in with their surroundings. When threatened, these birds shut their eyes, erect their feathers and point their beak in such a way to match the color and texture of the tree bark.


Image by C Coverdale at Wikimedia Commons.

Rather than hide, some animals have a physical appearance to disguise themselves as other species that are often fierce, toxic or venomous. This type of mimicry is called Batesian mimicry, named after Henry Walter Bates, the English naturalist who studied butterflies in the Amazon and gave the first scientific description of animal mimicry. This plate from Bates’ 1862 paper, Contributions to an Insect Fauna of the Amazon Valley: Heliconiidae, illustrates Batesian mimicry between various toxic butterfly species (in the second and bottom rows) and their harmless mimics (in the top and third rows).


This plate from Bates’ 1862 paper, Contributions to an Insect Fauna of
the Amazon Valley: Heliconiidae is available on Wikipedia Commons.

The bluestriped fangblenny takes its costume another step further, by changing its shape, colors, and behavior to match the company. This fish changes its colors to match other innocuous fish species that are around so it can sneak up and bite unsuspecting larger fish that would otherwise bite them back! Learn more about them here.

The fish on the far left is a juvenile cleaner wrasse in the act of cleaning another fish. The two fish in
the middle and on the right are both bluestriped fangblennies, one in its cleaner wrasse-mimicking
coloration (middle) and the other not (right). Figure from the Cheney, 2013 article in Behavioral Ecology.

But the Master of Disguise title has got to go to the mimic octopus. This animal can change its color, shape and behavior to look and behave like a wide range of creatures, including an innocuous flounder, a poisonous lionfish, or even a dangerous sea snake! Check it out in action:

Caught in My Web: What Your Dog Really Thinks About You, Understanding Gestures, Camera Traps and Pruney Fingers

Image by Luc Viatour at Wikimedia Commons.

This week in Caught in My Web, I share what I found when pondering interactions between humans and animals, what we have learned from camera traps, and what our pruney fingers in the bath may have to teach us about our animal nature.

1. Greg Berns, a psychiatry professor at Emory University, set out to use an fMRI scanner to learn more about what dogs think about their humans. Read his story here at Psychology Today. And check out this video describing The Dog Project:

2. Although dogs may be “man’s best friend”, they have failed numerous tests in understanding our gestures, such as pointing, without training. Even chimpanzees require training before understanding the meaning of human pointing. But elephants are now the first non-human species that seems to innately understand human pointing, naturally investigating objects pointed to (comparable to a 1-year-old human). Jack Flanagan discusses this research at NewScientist.

3. At The Thoughtful Animal, Jason Goldman discusses camera traps (weather-resistant cameras that use motion detection sensors to photograph wildlife) and how they are used in animal research. He also reveals the secret ingredient to luring jaguars to the cameras at You’ll Never Guess How Biologists Lure Jaguars To Camera Traps.

4. While we’re talking about camera traps, Siberian tiger researchers set up camera traps in southeastern Russia. One of their cameras took a series of 3 amazing pictures of a golden eagle attacking a sika deer. Check out the pictures at National Geographic.

5. Ever wonder why your fingers get pruney in the bath? Maybe it is a primate adaptation! Mark Changizi explains why at TEDEd:

Honeybees Can Avoid Deadlock When Making Group Decisions, So Why Can't We?

This honeybee swarm has precious little time to make a democratic decision as to
where they will move to. A decision deadlock could have fatal consequences.
Image by Nino Barbieri at Wikimedia Commons.

In case you've been living in a cave lately, the U.S. Government has been shut down since October 1st. Not because of a terrorist attack or a bank system meltdown or a natural disaster, but because Congress cannot agree on a spending bill to determine our government's funding plan for the next year. The government shutdown has its consequences (such as closed national parks, postponed federal research funding, the halting of the CDC's flu vaccine program, and unpaid federal employees), but these will seem like a slap on the wrist if Congress can't agree to raise the debt ceiling by October 17. If we are still in a government deadlock at that point, we will default on our national loans and suffer disastrous consequences (such as the devaluation of the dollar, social security payments not being made, spiking interest rates, and devaluation and forced selling off of bonds). Congress is up against a deadline to make a group decision, and the consequences of not making one in time are much higher than the consequences of making an inperfect one. It's hard to come to a consensus when so many individuals in the group have a strong opinion one way or another, but the fact of the matter is: honeybees can do it. So why can't we?

This week at Accumulating Glitches I tell the story of how honeybees democratically decide on what new home to move to, all while avoiding a deadlock at indecision. Check it out here.


And to learn more, check these out:

Seeley, T.D., Visscher, P.K., Schlegel, T., Hogan, P.M., Franks, N.R., & Marshall, J.A.R. (2012). Stop signals provide cross inhibition in collective decision-making by honeybee swarms Science, 335, 108-111 DOI: 10.1126/science.1210361

Seeley, T.D. Honeybee Democracy, Princeton University Press (2010).

And learn more about group decision-making in animals at Can a Horde of Idiots Be a Genius? and Why This Horde of Idiots Is No Genius