UPDATE: There have been no new deaths since August 7th. The necropsies have been unable to find a cause. There is at least 1 two year old still in residence, but no one is maintaining the dam at present. We are hopeful that two year old will get some company soon.


This article by Jennifer Modenessi is the best current information we have on the beaver deaths at present, because she took the time to speak with me twice and contact the veterinarians involved directly, both at Lindsay and CDFW.

Both beavers were female. The kit weighed in a 2.25 kg, or just under 5 lbs.

Three beavers have been seen as recently as 8-22  This page will be updated with any ongoing information as we understand more.

Beloved Martinez beaver babies turning up dead

UPDATE  8.14

The carcass brought in yesterday was too autolyzed (decomposed) for the pathologist to conduct any disease testing on or tissue examination – next they will try some toxicology testing.

don't feed8-18 No new deaths, but we continue to know nothing. All we know is what it isn’t. Not disease. Not Infection. Not toxoplasmosis. Not antifreeze. Not any toxic we have looked at, and we’re running our of beaver tissue to look at. I had a long conversation with the vet at CDFW yesterday and discussed the possibility of maybe doing a blood sample of one of the living beavers but she was very clear that this would only be useful if we knew what we were looking for.

And we don’t.

She said it was not worth traumatizing a beaver for very little information. And I was so relieved. Jon and I hated the thought anyway. One thing she did say is that the recently recovered beaver had apple in its stomach with a store bought label on it, and did we think anyone was feeding them? Or deliberately poisoning them?

Feeding, yes. Poisoning, who knows? So all we can do for now is keep a very close eye out and ask folks not to feed. The people who care about our beavers will stop, and the people who keep feeding will become suspects I guess.