no
One is poisonous and one is not poisonous.
cactus
Yes, holiday cactus plants [Schlumbergera and Zygocactus spp] are poisonous. So not one of their body parts are meant to be chewed, eaten or swallowed. Touching or smelling the body parts isn't a problem. Problems result only with the mistaken notion of the plant and its parts as a source of drink or food.
Yes, Thanksgiving cactus is not toxic to cats.
Yes, the Christmas cactus is not toxic to dogs.
Yes, Christmas cacti are not poisonous to humans or pets.
Yes, the Christmas cactus is non-toxic to cats.
Yes, the Easter cactus is non-toxic to cats.
Yes, the Thanksgiving cactus is non-toxic to cats.
Yes, Christmas cactus flowers are not toxic to dogs.
i think yes
Voles are not "poisonous," and are eaten by birds of prey worldwide.