The culprit is in general euphorbia peplus, and maybe some mercurialis, though this one is not so toxic... They are the only toxic plants I find. It is quite strange that animals, rabbits etc eat euphorbia among other herbs!
The amoount is so small that I do not think there can be a problem for human consumtion.
Who has an idea how the poisonning occurs and where is the toxin in the animal body? Of course a dead animal cannot be bleeded.
Thanks for any informations