No. 10 - Puffer Fish
The skin and certain internal organs of many Tetraodontidae, which is the family that puffer fish belongs to, are highly toxic to human. However, the meat of some species is considered a delicacy in certain countries such as Japan and Korea.
No. 9 - Poison Dart Frog
Unlike most of the frog, this species are active during the day and exhibit bright-colored skin. Many of this species are critically endangered. The name "dart frog" came from the indigenous Amerindians' who use of their toxic secretion to poison the tips of blowdarts.
No. 8 - Inland Taipan
Inland Taipan has various colors which depend on different seasons, ranging from dark tan to olive-green.
No. 7 - Brazilian Wandering Spider
The Brazilian wandering spider are venomous spider that found in tropical South and Central America. These spiders had recorded as the world's most venomous spider which caused death after a single bite by these spiders.
No. 6 - Stonefish
Stonefishes are primarily marine animal, found in the coastal regions of Indo-Pacific oceans. This species is capable of secreting neurotoxins from their glands which is toxic to other marine animals and human as well.
No. 5 - Death Stalker Scorpion
Death-stalker scorpion are found in Israeli desert, which generally originate from the commercial captive trade of the animal.
No. 4 - Blue-Ringed Octopus
This species are found in the Pacific Ocean, from Japan to Australia. This octopus is able to produce deadly venom or neurotoxin that contain tetrodotoxin which causes paralysis and sometime respiratory arrest leading to cardiac arrest due to lack of oxygen.
No. 3 - Marbled Cone Snail
Marbled Cone snail appeared as beautiful animal but one drop of its venom can kill more than 20 humans! This snails are commonly found in warm salt water environment, and do not even think of picking it up!
No. 2 - King Cobra
King Cobra is the world's longest venomous snake and numerous in forested areas especially in Southeast Asia and parts of India. Venom are passed to its prey once through its biting.
No. 1 - Box Jellyfish
Box Jellyfish are found in Australia, Hawaii and other tropical area. Box Jellyfish are best known by their extremely venom which can kill not only its prey but also humans. However, some marine species are immune to its venom, which are the turtles that usually feed on the jellyfish.
Source:
E-Amusing