Hey there!

I am currently doing an experiment on ant repellent and I noticed something weird which I would like to inquire about. For my experiment, I used chicken skin as the attractant to test whether the repellent works. I was hoping to get the same type of ants for all the set-ups so that my experiment will be fair. However, one of my set-up had black medium-sized ants attracted while the other had small red ants and medium-sized, big head red ants attracted. Both set-ups were done at the same time under the same conditions. I was thinking whether it is because the black ants and red ants were of different colonies/groups and do not mix and have their own territory. (The 2 different types of red ants could be from the same family/species.) So when any one type of the ants leave their scent on the chicken skin, the other type of ants will not come and invade their territory when they smell a foreign scent and the same type of ant will come instead when they smell the particular scent from their same kind. Thus, whichever type of ant that stumbles first on the chicken skin and leave their scent, that chicken skin will be invaded by that type of ant. Is my reasoning correct? Also, is there any way to only attract one type of ants? Because my experiment can only have 1 type of ants to be fair.

Thank you!

Regards,
Janelle

Hi Janelle,

Thanks for your interesting question and sharing your observations with us!

Without a picture, it is always hard to tell which ant species you encountered. Information on your location would be very valuable to get an idea on the ants identity as different ants are distributed in different parts of the world.

Ants of a single species often have the same color. This means that the red and the black ants you observed most likely belong to two different species. However, the red small ants and the red bid headed ants might actually be different casts of the same species. For example, there is an ant genus named Pheidole, which has two or sometimes even three different casts. The big headed individuals are called the soldiers or major workers, while the little ones are called minor workers (but as any ant workers, these are all sterile females). Here is a picture of two ants from the same species and even same nest. In this picture, you see that not only is there a distinct difference in size and morphology (i.e., shape), but also the color between the two individuals differs.

PheBar6.JPG

Pheidole barbata - an ant species with two distinct casts. Photo from http://www.myrmecos.net.

As for whether ants are deterred if a different species has left pheromone trails, I think it depends on the species identity. A dominant species would not care, while a more timid species might be repelled.

For your experiment, I think that it does not matter whether you attract ants from one or more species. You could just note how many individuals of how many different types of ants were attracted (as species is sometimes hard to distinguish). Another approach could be that you go out and collect a bunch of ants from a single nest and then test their reaction to the chicken skin in a plastic box. This would also control for other factors, such as soil type etc.

Hope this helps!

Steffi Kautz & the AntAsk Team




I was vacuuming my house And when I got to my front entrance a had a swarm of these ants all over front door and walls...... It is quite a large ant approx a 1/4" long. I have heard that fire ant have been invading our area I have small pets and children so this was concerning to me.

I can get a better picture if needed

Michelle from Surrey BC, Canada.


Dear Michelle:

The photo lacks clarity, so we won't post it, but nonetheless I can assure you it is not a fire ant, and apparently is one of your native Formica or Lasius species (which have no sting).

Further, though we have had warming winters in recent years, the essentially tropical fire ants are still not established anywhere in or near Canada. The closest location to you is Orange Co., (far southern) California.

I hope this allays any fears for pets or children.

James C. Trager of the AntAsk Team

Hello,

I have a two part Ant question that I am just so curious about.

We have a patio paved with stones and we have an Ant nest under it.We have seen the small reddish ants and their activity.

1. My question is are the Ants able to predict when it will rain? A day before rain comes we notice small sticks sticking out of the Ants nest holes.The sticks are in a very regular pattern,spaced about 6-10 inches apart.After the rain is gone for a day the sticks go away.

2. Is there more to plugging the holes beyond keeping rain out? Are they funneling water?


It is just so fascinating,we love watching wild creatures and their behaviors and when it's right out the back door, WoW!

DSC04479.JPG

Thank you so much for your time. We hope to hear from you soon,

Chance and Rois



Hi Chance and Rois,

Thanks for contacting us with these puzzling observations! I am not entirely sure about both your questions and here are some thoughts. As far as I know, it has never been scientifically proven that ants were able to predict rain, but there are many stories which claim it. There are also studies that claim that ants might even be able to predict earthquakes, because they sometimes nest on fault zones. It is hypothesized that ants detect Helium which is released before an earthquake.

Coming to your second question, I can only guess. I have never observed this behavior myself, but I've seen ants that cover their nests with rocks. This might be to prevent intruders from coming in or for keeping the rain out. In my own driveway, which has lots of cracks in the concrete because of tree roots, I also sometimes observe little sticks standing out. But we have little ants in the driveway and I think that earth worms are pulling the little sticks in to feed on them. They seem to chew them down. However, the sticks I see are much smaller and look softer than the one that you were showing. I found a picture online in which an earth work pulls a leaf into the ground to feed on it.

I think the only way to find out what is pulling the sticks in would be to dig it up. Let me know if you do so and what you find.

tempx_boden_regenwurmblatt_.jpg

Here is a picture of an earthworm pulling in a leaf. (image taken from http://www.planet-wissen.de/alltag_gesundheit/landwirtschaft/wiese/wiesenaufbau.jsp)

I hope these thoughts help!

All the best,
Steffi Kautz & the AntAsk Team

Hello,

I saw a picture of a leaf cutter ant and some other ants. The leaf cutter ant has a white circle (eye) on the center of its head. I noticed other ants have something there also but in different arrangements of three spots or the coloration is different. What is this? What is it for?

-Abigail

******

Hello Abigail,

The white circle you observed on the leaf cutter ant Atta cephalotes is a simple eye or ocellus. Ocelli occur in many other insect orders and function as auxiliary light sensory organs. Unlike the two main compound eyes, these simple eyes consist of a single ommatidium or "lens" and can perform only basic light/dark distinction. They are not typically found in the worker castes of most ant species but when they do occur, as in the genera Atta and Formica, they range in number from 1-3. The queens and males of all ant species always have 3 ocelli.

Thanks for your question,

Alexandra Westrich, Ben Rubin & the AntAsk Team


Hi all,

What is the biggest and the smallest species of ant? And where do they live?

Thanks, Cassio

******
Hi Cassio,

The biggest ants in the world are from the genus Dinoponera. The workers are about 3 cm in length (more than one inch). There are currently six valid species in the genus Dinoponera and they occur in Neotropical rainforests. The ant species Paraponera clavata, the giant Neotropical bullet ant, is also extremely large and the workers reach sizes of about an inch. Paraponera clavata also occurs in rainforests of the Neotropics and is distributed from Honduras in the North to Brazil in the South.

There are many very small ant species and the smallest probably belong to the genus Carebara. This genus comprises 160 valid species, which are found almost worldwide.

252305072_qea26-L-1.jpg
Dinoponera australis - one of the largest ants in the world. Photo from http://www.alexanderwild.com/

All the best,
Stefanie Kautz, Arista Tischner & the AntAsk Team

When in Borneo, I noticed that the Diacamma ponerines on the forest floor of primary forest surrounded the entrance to their nest at the bottom of saplings with nests of twigs like birds' nests. Do you know what these are for? They also turned out to be regularly spaced.

Thanks,

Ruth Levy

******

Hi Ruth,

The stacks of twigs over the entrances of the colonies you found are likely required for proper nest thermoregulation. Temperatures in ant nests must be maintained within particular limits or the ants may die or their young may fail to develop correctly. The twigs can contribute to temperature control by keeping nests out of direct sunlight and protecting against wind. We have several previous posts on colony temperature regulation here, here and here.

Thanks for your question,

Alexandra Westrich, Ben Rubin & the AntAsk Team

Hello,

I have a general question about ant colony size:

Having secured their resources, why does an ant community choose expansion in size, structure and function? I guess that at a certain limit of population size things will start to get more difficult with every increase in contrast with a small population where more workers will make life easier and growth is a healthy thing.

Provided that resources are endless will an ant colony continue to grow or is there a target to be achieved? Will ants limit their population if food is scarce for example?

Grateful for your help,
Ibrahim


Hello Ibrahim!

The size of an ant colony has to do both with the ant species and the availability of resources. With that said, it seems to be genetically determined how big an ant colony can get. Many ant colonies have only one egg-laying queen, while others have several and can reach larger colony sizes. Some species only reach colony sizes of a few hundred workers, whereas others can reach colony sizes of over a million, or several millions (for example leaf cutter ants). On the other hand, an entire ant colony of the genus Temnothorax can nest in a single acorn. However, when resources are scarce, an ant colony might not be able to expand to its full potential size.

Hope this helps,
Arista Tischner & the AntAsk Team

While hiking in a remote and Primitive forest in Lassen County of northern California I came across one very large ant.

All of the ants I had seen earlier that day were large and black. They were approximately 1/2 inch long and very stout. I hiked several more miles into a truly primitive and rustic area and found a black ant that was at least one inch long. I thought it must be some sort of queen but it was all alone. Any idea what it could be be. Could it be a carpenter ant? The trail is not far from the Pacific Rim trail which starts in San Diego and maybe this ant hitched a ride. I have looked everywhere and it seems that most ants in north America are under 1/2 inch.

I wish I had taken the poor fellow home. If the ant is unique then I will go back this summer and try and locate him and bring him back for research. If there is one, there is likely more ants.

Your advise is greatly appreciated,

Sincerely,
Matt

*****
Matt,

Thank you for contacting AntBlog.

Unfortunately without a photograph it is difficult to say what ant species you observed, but from your description it is not out of the realm of possibilities that you found a queen of the larger ants (likely carpenter ants from the genus Camponotus) you saw earlier on your walk. Queens are often larger than workers and new founding queens can be exploring the local environment to find a suitable new home to start a colony.

You can see a list and photographs of the ants of California here.

Best regards,
Corrie Moreau & the AntAsk Team


hi--this morning we observed a lot of sidewalk ants swarming in our backyard (coming in/out of pavement cracks). there were winged ants (males?) flying up and dropping down periodically. some seemed to be struggling--flying around on their backs before righting themselves. now this evening there is no swarm, but some new piles of debris along some of the pavement cracks that a few ants are tending.

what was going on this morning? any help is appreciated!

tx,
virginia
philadelphia

-------------

Dear Virginia,

Although it is hard to identify the ants without pictures, it is quite possible that they are the common European pavement ant (Tetramorium caespitum), which have become one of the most abundant insects in the Northeastern US. If you want to try to identify them, follow this link to the AntWeb species page for Tetramorium caespitum.

As the winged ants are the reproductive members of the colony, it is possible that the colony you are observing was sending out queens and/or males to reproduce with other nearby colonies. Often, they form mating swarms with queens and males from many different colonies, so if the all the members of the swarm were winged, then it is likely that you were observing a mating swarm.

If there were only a few winged members in the swarm, then it is possible that you were observing a territorial battle between two different colonies of Tetramorium caespitum. These are fairly common on sidewalks and between pavement cracks, and have been documented well by the fantastic photographer Alex Wild. See the picture below for an example of these battles (Photo by Alex Wild).

1018633902_jcYV5-L-1.jpg

I hope this answers your questions!

Best,

Max Winston & the AskAntTeam

Hello,

I've always thought red and black ants were carpenter ants but I cannot find any picture of a carpenter ant that looks like these--and my land is crawling with them. We do have black carpenter ants on our porch (most unfortunately), and these are something else entirely.

Could you identify these for me? Is there anything I need to do to keep them in check within my ecosystem, and what natural controls would be optimal?

Thank you,

Chaya

april 019.jpg

******

Hi Chaya,

Carpenter ant is the common name for ants in the genus Camponotus, but the ants on your land are wood ants in the genus Formica. We have a few previous posts that mention these ants here and here. Wood ants are native to North America and play an integral part in your local ecosystem by clearing away other insects and harvesting fallen pine needles for their nests. They are relatively harmless and do not normally require special control measures unless you find them to be excessively bothersome. They often change the location of their colonies so you may notice their numbers vary over time, even without any outside influence. Many wood ants can also construct large thatch mounds like the one shown here:

FormicaObscuripesNest-M.jpg Photograph courtesy of alexanderwild.com

Thanks for being concerned about your backyard ecosystem!

Ben Rubin, Alexandra Westrich & the AntAsk Team

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