There is more than one venomous mammal in the world. Male platypuses have a poisonous spur (claw) on each of their back legs. The slow loris is the only primate to be venomous. It has a poisonous bite. Several species of shrews (tiny mouse-like creatures) have poisonous bites. The solendon looks like a shrew but has a long nose. The solendon has a poisonous bite.
Now by venomous do you mean most potent, or most prominant?
Most prominant would be the King Cobra.
"One single bite of this deadly snake can easily kill a human. This snake is even capable of killing a full-grown Asian Elephant within 3 hours if the larger animal is bitten in a vulnerable area such as the trunk. It's venom is not as toxic as other venomous snakes, but King Cobra is capable of injecting 5 times more venom than black mamba and can result in mortality up to 5 times faster than that of the black mamba. It is quite widespread, ranging across South and South-East Asia, living in dense highland forests."
Most Potent would have to be The Golden Poison Frog "The Golden Poison Frog (Phyllobates terribilis) carries only one mg of poison, yet can still kill up to 20 people."
The platypus is not the only venomous mammal.
Listed below are mammals that are venomous or that use poisonous or noxious chemicals in some form.
Cuban Solenodon (Solenodon cubanus)
Haitian Solenodon (Solenodon paradoxus)
The Duck-billed Platypus (Ornithorhyncus anatinus)
Eurasian water shrew (Neomys fodiens)
Northern Short-tailed Shrew (Blarina brevicauda)
Southern Short-tailed Shrew (Blarina carolinensis)
Elliot’s Short-tailed Shrew (Blarina hylophaga)
The solenodon and the platypus are both venomous.
No. They are very territorial and VERY dangerous but not poisonous.
There are two misconceptions in this question. First, there are no egg-laying marsupials. All marsupials give live birth. Second, there are numerous venomous mammals. Many species of shrew, as well as the Cuban Solenodon, are venomous mammals. The only egg-laying mammal that is venomous is the platypus, which ejects venom through a hollow spur on each ankle. Only maturemales have spurs and can eject venom. The platypus is a monotreme, not a marsupial. Monotremes are egg-laying mammals.
Yes. There are other venomous creatures though
No a black Mamba is not a mammal it is a reptile because it is a snake it is infact the fastest snake in the world.
No, an adder is not a mammal. Adders are venomous snakes found in Europe and Asia.
Mongoose.
platypus Technical point #1: Since only the male platypus has the venomous spurs, and only the female platypus lays eggs, there would actually not be any venomous egg-laying mammals. Technical point #2: There are no egg-laying marsupials. The platypus belongs to the monotremes.
The species is the second longest venomous snake in the world, exceeded in length only by the king cobra.
Primate
There are over 2,400 types of snakes in the world an only about 400 of them are venomous.
No, because the platypus is not a marsupial. A platypus is a monotreme (egg-laying mammal). It is not the only venomous mammal. "Venomous" is the correct term, rather than "poisonous", as things which are poisonous must be ingested, i.e. eaten or drunk. Other venomous marsupials include the Cuban solenodon, Eurasian Water Shrew, Northern Short-tailed Shrew and Southern Short-tailed Shrew, just to name a few.