Yes, this philodendron plant is toxic, though it is not known to be deadly. The reason philodendrons such as the birkin is toxic is due to the calcium oxalate crystals in its foliage. Consumption of this causes irritation in the mouth and the digestive system, which is very unpleasant. Regardless, it is still a good idea to keep these plants out of reach from pets and curious children who might try to take a bite out of your plan