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Threatened by Cattle Medication

Threatened by Cattle Medication
Photo Information
Copyright: Ivan Kruys (Argus) Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 5038 W: 260 N: 15594] (50626)
Genre: Animals
Medium: Color
Date Taken: 2008-08-07
Categories: Insects
Camera: Canon 400D, Canon EF 300 f4L + Canon 1.4 converter
Exposure: f/5.6, 1/800 seconds
More Photo Info: [view]
Photo Version: Original Version
Theme(s): Robberfly, Robber flies (Diptera: Asilidae) of Europe, Haraprasan's Favs, Pentaxfriend's favorites 2, Dipterans (except Hover flies) of Europe-3 [view contributor(s)]
Date Submitted: 2008-08-11 9:36
Viewed: 4907
Points: 56
[Note Guidelines] Photographer's Note
The Hornet Robberfly (Asilus crabroniformis)

It has caught and is feeding on a Staphylinid, or Rove Beetle, characterized by its short wing cases. While feeding it is relatively easy to approach as the Hornet Robberfly is protected from being attacked by bird by its appearance. Its size and the brown and yellow warning coloration that resembles a hornet wasp is enough to deter most predators.

But this large 2.5cm long (over 1 inch)Robberfly has become much rarer and is threatened by the medication of cattle because its larvae feed on other insect larvae that live in cattle dung. When cattle are treated with medicines to remove internal parasites, these medicines remain in their pats, which makes life impossible or difficult for the larvae of those insects that are dependent on feeding on cattle dung.

As this was taken on a nature reserve, the cattle grazing it are presumably not treated by such medicaments so that their cow-pats are reasonably full of life.

The problem of cattle medication has also led to deaths of vultures that feed on their carcasses in India, so that now several species of vulture are now nearly extinct.

It isn’t only the medication of cattle that causes environmental problems: our own medicines cannot be destroyed by sewage treatment and their effect on the environment of our lakes, rivers and seas has yet to be evaluated but we already know that contraceptive hormones are affecting the breeding capacity of many species of fish.

Indeed, our behavior regarding the release of medicines and thousands of chemicals into the environment is still very primitive.

This was taken at a distance of about 1.8 meters with the camera hand-held. After moderate cropping and size reduction the image was selectively sharpened.

nglen, batu, pankajbajpai, jaycee, crs, haraprasan, siggi, Alex99, pvs, Pentaxfriend, pekkavalo1, eqshannon, CeltickRanger, vral, sandpiper2, anel, sranjan, red45, MMM, boreocypriensis, weeksy, cicindela, marhowie, elizabeth, SelenE, jusninasirun has marked this note useful
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To cicindela: ThanksArgus 1 08-19 01:20
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Critiques [Translate]

  • Great 
  • nglen Gold Star Critiquer/Silver Workshop Editor/Gold Note Writer [C: 2883 W: 30 N: 9683] (36145)
  • [2008-08-11 9:40]

Hi Ivan. Firstly most interesting notes and somthing to make use think about. This is a first class posting in all ways. From the sharp focusing to the fine detail. Your use of the light has given natural colours. with a good POV/DOF. well done TFS.

hello ivan,
very nice capture, i thought that you have used a macro lens here, great sharpness with amazing details, well composed shot,
tfs & regards

  • Great 
  • batu Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 1079 W: 293 N: 4497] (16383)
  • [2008-08-11 9:44]

Hello Ivan,
thank you for posting this excellent picture and the story around.
Best wishes, Peter

  • nagraj Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 1618 W: 106 N: 3208] (15166)
  • [2008-08-11 9:51]

hi ivan,
your notes are highly appreciable and you have rightly mentioned the problems of nature facing with this good image of robberfly as an example. tfs. nagraj.v

  • Great 
  • jaycee Gold Star Critiquer/Silver Workshop Editor/Gold Note Writer [C: 2454 W: 10 N: 8044] (25460)
  • [2008-08-11 10:00]

Hi Ivan,

Both notes and picture are extremely interesting. Lots of problems to be soloved in our world. I'm not sure if I have seen a Hornet Robberfly before. He looks rather menacing pictured here with his prey. Excellent shot, as always, with nice colors and immaculate details. Great timing to catch this action. Background is wonderful and I love the diagonal composition.


  • Great 
  • crs Gold Star Critiquer/Gold Note Writer [C: 469 W: 0 N: 922] (3551)
  • [2008-08-11 10:07]

Hi Ivan,

Your photo is impressive! the DOF is so good that even very fine details of insect's body can be clearly seen. Also you have rendered so many color tones on the insects as well as in the background. The light is well used and the reflection in hornet's eye looks great.

Thank you for sharing,

Hi Ivan,
A nice capture of this beautiful robber fly along with its prey. Yes the medications to cattle makes life impossible for these beauties. When I was a kid often returning from school I see a lot of vultures feeding upon carcases and I always thought when I will grow up and own a camera I will surely capture the beautiful scavengers. But alas my dream is still now a dream. Hope the vultures will return. Very well composed with sharp details. Thanks a lot for sharing.

  • Great 
  • siggi Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 3097 W: 109 N: 12399] (52850)
  • [2008-08-11 10:24]

Hello Ivan,
Stunnig photo!Great capture!
Very good on details and sharpness!
Excellent DOF and BG!
Best regards Siggi

  • Great 
  • Alex99 Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 4072 W: 133 N: 7096] (23735)
  • [2008-08-11 10:41]

Hi Ivan.
Very good and informative note and superb picture of a nice scene. I like wonderful diagonal composition of the image, details and sharpness of the predator and prey as well as the twig are amazing. Lights, exposure and colour palette are superb too. However, the key point of the picture is subject and brilliant POV. Bravo. Well done.

  • Great 
  • pvs Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 1127 W: 254 N: 3161] (14464)
  • [2008-08-11 11:00]

Hi Ivan,

A great capture,well diagonally composed,with excellent light,details and sharpness,the light green BG finishes this capture which could be an illustration in any book,thanks


Hi Ivan,

Superb shot with amazing sharp details, lovely colors, beautifull POV and neutral BG

best regards Thijs

Hi Ivan,
Excellent capture of this Robberfly with good composition and POV, working DOF and sharp details. I find the notes very interesting as well. The effective breeding of livestock has amazing environmental consequenses.

Now that is a Master class both in imagery and in personal notes well thought out and heard well here! Just super Ivan. I am very impressed with this lesson!

  • Great 
  • vral Gold Star Critiquer/Gold Note Writer [C: 65 W: 1 N: 218] (1049)
  • [2008-08-11 23:57]

Hello Ivan,

wonderful macro of this Robberfly with a prey. POV. details and DOF are great. Very useful notes.
Thanks for sharing

  • Great 
  • gannu Gold Star Critiquer/Gold Note Writer [C: 988 W: 4 N: 3277] (14761)
  • [2008-08-12 3:43]

Hello Ivan, Superb notes and then beautiful shot. Great and sharp focus and sharp picture. The lighting is amazing ganesh

Hi Ivan

Good capture and interesting note, we don't understand insect ecology enough in my opinion. Good sharpness and composition.


  • Great 
  • anel Gold Star Critiquer/Gold Note Writer [C: 3053 W: 3 N: 8715] (40574)
  • [2008-08-12 5:32]

hello Ivan,
Impressive picture! Excellent sharpness, interesting scene, beautiful background. I really appreciate also your note which clearly shows that human interferences in nature always have consequences..
Thanks a lot

Hello Ivan,

Very good sharp picture of this Robber Fly with its prey which is also very sharp. I like very much the composition with diagonal composition. Excellent DOF and focus. Good light and colours.

Hi Ivan,
Very good macro of Hornet Robberfly with excellent details & interesting photographers note. TFS.

  • Great 
  • red45 Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 2636 W: 74 N: 9091] (31094)
  • [2008-08-12 10:46]

Hi Ivan!

Really big robber fly. I've not seen this specie in my life. Great side view with, razor sharp, full of details. I think spiky twig is very suitable for this kind of predator. Great macro.

  • Great 
  • MMM Gold Star Critiquer/Gold Note Writer [C: 1114 W: 0 N: 2546] (11425)
  • [2008-08-12 12:54]

Hello Ivan
Great capture.Very sharp and full of nice detail.Very nice OOF BG to.I also taught that you had used micro lens.Your text is excellent to.
TFS Michel

Hi again my friend,
A great macro and document as usual with superb photograpghic quality as usual. TFS.


hello Ivan

excellent shot of the life in nature, fine POV and appropriate vertical framing,
superb focus on the foreground, i love the background's colour tones,
beautiful luminosity of the image, excellent sharpness and details,
and educative Photographer's Note, TFS


Hej Ivan
This one was really good one. You have captured everything on right place with good quality.
TFS / Hälsningar

På något sätt har jag tappat lust att vara aktiv på den här sidan, annars har massor med nya spännande bilder...

Hello Ivan!
What a capture! I always wanted to see this species of Asilidae in the wild! And I am still dreaming about it! (and of course about pgotograph it :>). Very interesting picture of rather rare (at least in my region) species. And also very good documentaryimage, as Staphylinidae beetles are not a common prey of this predatory flies.
If you agree I would like to add this unique photo to the theme "Robber flies of Europe" :>
All the best and thanks for showing this picture!
Friendly yours,

Hi Ivan, my kinda shot :)
Very good detail, color, exposure, BG, POV, and diagonal comp.
Hard to believe their threatened status..
Leave it to mankind and he'll screw up the balance in nature every time.
Well done!

An interesting and informative capture with equally informative notes. Your image is nicely composed and the colours are vibrant. I like the way the simple background allows the subjects to clearly stand out. Awesome!

  • Great 
  • SelenE Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 2249 W: 65 N: 4205] (13972)
  • [2008-08-31 13:40]

Hi Ivan,
I like the focus, sharpness, details, color tones, lighting and composition a lot. TFS
Best wishes,

Hello Ivan.
I like this shot showing the brute strength of the robber fly. Love the colors and details with diagonal framing. Nicely focus against the silky smooth green background.
Thanks and have a nice day.

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