Both of them are dangerous. The lionfish is full of poison spines and skin, and eats meat. Tigerfish eat meat and have sharp big teeth, but are not poisonous.
The Monito Gecko is not dangerous, it is extremely rare. The Monito gecko is endangered. Its Binomial name is Sphaerodactylus micropithecus and is closely related to S. macrolepis, a species common...