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Strange burrows
Posted: Wed Aug 09, 2023 5:54 am
by lamprima2
I often see these mysterious burrows at the edges of the trail in San Elijo Lagoon Preserve (Encinitas, California).
I've never seen any creature getting in or out of them. The holes are from about 5 to 15 mm in diameter.
Can anyone suggest a host?
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Re: Strange burrows
Posted: Wed Aug 09, 2023 7:51 am
by wollastoni
Some wild bees can make this kind of holes in France...
I guess other insects too...
Re: Strange burrows
Posted: Wed Aug 09, 2023 3:42 pm
by livingplanet3
lamprima2 wrote: ↑Wed Aug 09, 2023 5:54 am
I often see these mysterious burrows at the edges of the trail in San Elijo Lagoon Preserve (Encinitas, California).
I've never seen any creature getting in or out of them. The holes are from about 5 to 15 mm in diameter.
Can anyone suggest a host?
They look much like the exit holes of cicada nymphs -
https://bugoftheweek.com/blog/2013/1/17 ... -brood-xix
- but 5-15 mmm suggests they are something else.
Re: Strange burrows
Posted: Thu Aug 10, 2023 3:42 pm
by 58chevy
Could be burrows of Sphecius grandis (western cicada killer)
Re: Strange burrows
Posted: Thu Aug 10, 2023 9:33 pm
by lamprima2
Thank you all. The suggestions look reasonable,
though, I've never seen cicadas or Sphecius
in our area. I could overlook these insects, of course.
Re: Strange burrows
Posted: Fri Aug 11, 2023 8:01 am
by Kona
Vole burrows
Re: Strange burrows
Posted: Sun Aug 13, 2023 3:48 am
by lamprima2
Kona wrote: ↑Fri Aug 11, 2023 8:01 amVole burrows
Too small for voles
Re: Strange burrows
Posted: Sun Aug 13, 2023 9:24 am
by Cabintom
Millipedes? I recently brought home a couple of millipedes from the forest (my daughter seems interested in them) and was surprised to find they had dug burrows all through the terrarium.
Re: Strange burrows
Posted: Sun Aug 13, 2023 8:19 pm
by Panacanthus
I would bet on livingplanet3’s suggestion. These look more like “one time use” exit holes than repeat entrance/exit burrows, and there are at least 65 species of cicada in CA, some of them quite small, such as Okanagana bella.
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Re: Strange burrows
Posted: Sun Aug 13, 2023 8:36 pm
by lamprima2
I agree: they look like exit holes.
I'll try to ask park rangers, perhaps they saw these
insects emerging.
Re: Strange burrows
Posted: Sun Aug 13, 2023 8:42 pm
by Kona
Not insects. Not invertebrates.
Voles
Re: Strange burrows
Posted: Sun Aug 13, 2023 9:27 pm
by livingplanet3
Panacanthus wrote: ↑Sun Aug 13, 2023 8:19 pm
I would bet on livingplanet3’s suggestion. These look more like “one time use” exit holes than repeat entrance/exit burrows, and there are at least 65 species of cicada in CA, some of them quite small, such as Okanagana bella...
Another genus of small cicadas found in CA is Platypedia -
https://bugguide.net/node/view/1398422
Re: Strange burrows
Posted: Mon Aug 14, 2023 9:01 am
by adamcotton
Kona wrote: ↑Sun Aug 13, 2023 8:42 pm
Not insects. Not invertebrates.
Voles
I am sure everyone would be very interested to hear why you believe the holes are made by voles.
Adam.