Test yourself: which photo shows bb fecal?(30 posts)
Look at the photo below.
The image shows two pieces of plain wallpaper, each 2 inches long. One was left in a pot with bedbugs, the other was left in a pot with another common household insect.
Which is from the bedbug? What is the other insect?
My guess is B......
I guess I have to wait for more responses to find out if I'm correct or not..... lol
They look almost identical to me (good thing I'm not a PCO), but "B" looks like it's got more bloody feces (I say this with the American definition of "bloody"), so I will say "B".
(I say this with the American definition of "bloody"), so I will say "B".
A = BBs
B = American Cockroach
A is BBs.
Scatology isn't my strong suit.
Letter B is the bedbug.
Wow so A is the bbs? I thought B because some of the feces looked thicker. Bb feces can look watered down and also have watered down ring around the edges too?
None of the feces can be lifted up with tape can it?
How wide a circumference can bb feces have?
Looks like I failed the entomology course
no i don't think we got the answer yet from Richard_Naylor...
It's good to see the pros are in agreement - or is it?!
I'll let you know tomorrow.
Before seeing Effe and Jim's response I would have guessed "B" because of the little tails on some of the blood spots -- but then again I was positive that what turned out to be a beetle caught in my bathroom was a bed bug!
I agree with EffeCi.
A Bed bug
Where is option C ?
A for sure is Bed Bug fecal ... B is either Oriental or American roach. My guess for B is American cockroach.
A= bed bugs.
B= Cockroaches? (If so, is the reddish stuff food stains? Vomit? Messy eaters...)
And the answer is...
A - Bedbugs
B - Blowflies (calliphora)
It is good to see the experts weren't fooled.
That's cool to see, yay for the experts! (and by cool I mean 'gross' and 'wish I didn't know about these' of course!)
I wondered, is there anything to the fact that the A sample was more grouped (congregated?) in one corner, I have read that BBs group together due to fecal traces...
-grateful for help
Well i'll be a monkey's bottom.
Richard_Naylor - 23 minutes ago »
And the answer is...
A - Bedbugs
B - Blowflies (calliphora)
No problem with the BBs one but, after I wrote my answer, I went in my "vault" to check my american cockroach colony... I controlled their faecal spots on the cardboard surface of their harbourages and then I thought "Rats! They aren't..." .
Well spotted G.f.H.,
The heaviest fecal spotting was where the bedbugs were aggregated in the pot.
Sleepless : "How wide a circumference can bb feces have?"
That's all down to hos absorbant the surface is and how aqueous the fecal spots are. The largest one in that photo is about 5 mm (or 3/8 inch) in diameter.
Thanks Richard. That was a great test. Fun too. Although, i have to say, now I'm freaked out.....
Another question, the fecal stains on sheets cannot be lifted up with tape can they? they absorb into the fabric right?
That's right. Unless the fabric is water resistant the fecal spot will be absorbed and won't be able to be picked up on tape.
Too many on B were streaky and many looked like dirty dishwater.
A had one or two exceptions but all other were slight amber to black.
Thanks again Richard. Your posts are most informative.
YAY I WAS RIGHT!!!!!!!!! I went by the consistency of stain size and pattern as opposed to colour. My guess was A. and no, I am NOT just saying that now that the answer was given
Richard, I noticed that in addition to the black stains there were a lot of light yellow stains. I had no idea BB fecal could look like that. If the black spots are digested blood, what are the yellow spots?
I've never heard of blowflies, but I was happy to know the answer - i knew A was bedbugs. Thanks to the generous postings of the experts on this site, I am more confident in my ability to identify bb fecal if ever I am to encounter it, god forbid.
Glad you enjoyed it!
"I noticed that in addition to the black stains there were a lot of light yellow stains."
The light yellow marks are uric acid. All animals have to get rid of their nitrogenous waste (which comes from digesting protein). The easiest way it to get rid of it as ammonia, but this is very toxic so it has to be very diluted. No problem for aqatic animals such as fish, but no good for animals with limitted access to water. The next best way is to excrete it as urea (as we do). The process of converting it uses some energy, but the outcome is a product that is less toxic and can therefore be excreted in higher concentrations, so less water is wasted. Animals that really need to conserve water, go one step further and use more energy, excreting their nitrogenous waste as uric acid. This is not toxic and can be excreted almost dry. Aside from many insects, this is what birds and reptiles tend to do. Bedbugs have a very high protein diet, so it is not surprising that they produce a lot of it. Since they are often excreting it at the same time as excreting the digested blood, it often gets mixed, so you end up with a spectrum of colours from almost white (uric acid) to almost black (digested blood).
"I've never heard of blowflies"
You might have a different name for them, but I'm sure you will have come accross them as they are very common. These are the large, slow flying flies that often crash against your windows trying to get out. The family includes the greenbottles and bluebottles. The ones I used were hatched out from maggots I bought at a bait shop.
Richard, thanks for the explanation of the uric acid. I had never seen it mentioned when discussing looking for signs of bedbugs. Is that because if the bug is excreting uric acid we should also be seeing fecal traces? I have seen a few small yellowish marks on my bedding that kind of look like that, but actually assumed it was rust from the washer (if things sit for awhile in there, they can get rust stains). I'm wondering if I should be keeping a better eye on that now.
The whole post was so informative, and made me realize that even if I do see a mark here or there, there could be a lot of other insect-related explanations for it. Thanks!
"Richard, thanks for the explanation of the uric acid. I had never seen it mentioned when discussing looking for signs of bedbugs."
The black traces are produced very soon after (or even during) feeding. Consequently these are the ones that tend to be left behind on the bed sheets as the bug returns to its harbourage. The uric acid marks are produced as the bug digests its meal, usually back in the safety of the harbourage. Consequently, these marks tend not to be found on the sheets, but are usually around the crevice where the bug spends most of its time.
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