upstate ny, came out of dead rabbit
Location: Greene County, NY
July 24, 2011 4:44 pm
Have no clue.. it is alive and crawls around.. found it while cleaning a dead rabbit can you help
Signature: FoX83

Bot Fly Larva

Hi FoX83,
This is the larva of a Rodent Bot Fly in the genus
Cuterebra.  The larvae are endoparasites found on certain mammals.  The Bot Fly larva forms a warble, generally on the neck of the infested host, and though they look quite nasty, they are alleged to not harm the host.

Location: New York

11 Responses to Bot Fly Larva

  1. Mickey says:

    “and though they look quite nasty, they are alleged to not harm the host.” We had one in our cat’s stomach some years back here in Florida and the larva caused the tissue to go necrotic. An expensive vet visit later and drains and such kept the cat from probably dying from it. So, perhaps when they’re on squirrels and such they won’t hurt them, but I can say for cats, no bueno.

  2. Tom kane says:

    Thank you for solving my mystery. Two dead mice in traps yielded two bot fly larva. We had no idea what we were dealing with. You are very knowledgeable and helpful. Here in PA we have all sorts of pests. Thanks once again.

  3. Brian says:

    I have found 2 mice in traps now here in SW Michigan with this larva in them, my concern is if they can be found in Turkey’s as well, I raise a small number of them to sell every year to sell to family and friends. Thank you

  4. Liz K says:

    I live in Upstate NY border of PA . A couple of years back I found a dead mouse underneath my oven. This is quite common and my cats usually catch them. They somehow come in from outside to that area. Anyway this particular time there was a black slimy looking thing lying next to the dead mouse , still moving. I quickly shoveled both up and threw them outside. I was at a lost as to what the black thing was. Now I believe it was a bit fly. I guess the mouse had gotten too small and it came out on its own?

  5. sean smith says:

    I live in southern Ontario. I own a Chihuahua, we spend alot of time outside together. Last summer while she was sitting on my lap a weird long slender brown fly landed on its back. I brushed it off but like it was attached to a bungee cord it would fly right back to the spot i just brushed it off of. It seemed to be using its wings to flap and burrow into the dogs fur. It seemed so desperate to do whatever it was doing. I thought it was trying to bite the dog or lay eggs on or in it.
    Now just today I came in from a walk and an identical fly was on the dogs back. I thought it was just a piece of fuzz so i brushed it off with similar results as last summer. Their was no larva last time I hope im wrong or I got to it before it laid any eggs.

  6. Liisa says:

    We just found two of the large larvae crawling out of a rabbits neck after shooting rabbit .central ny herkimer county August 2019

  7. jill howley says:

    I found one of these on my kitchen floor..totally grossed out..we have had the odd mouse in our house. Can these things harm people..I read that these flies are parasitic..would they lay eggs on us..ooohhh im so upset..Im going to have to move !!

  8. michelle andras says:

    I come home n found 3 baby kittens on my door step they about 3 to 4 weeks old one had a huge bot fly in it’s neck n I did pull it out but I won’t do any more bc it left an abscess n the babys neck n the other one had 2 one in the ear n one in the neck but lucky for that one they was small .. I took them both to the vet n got the bot flys n abscess out n they doing really good now on there meds

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