In article ,
Janet wrote:

"Yew trees are deadly poisonous to horses! They are so toxic that even
chewing on a single branch can (and frequently does) cause INSTANT
death. ...

Well, that's obvious crap. Horses are mammals, and the mammalian
digestive system just doesn't work that fast. Even anaphylactic
shock isn't instantaneous, following the cause.

That being said, horses are very delicate creatures, and it is
quite likely that they are very sensitive to yew. They are more
at risk from adder bite than humans, despite being up to ten times
the body mass.


Regards,
Nick Maclaren.