Golden Poison Frog or the Golden Dart Frog is currently considered the most poisonous vertebrate worldwide. The Golden Poison Frog’s skin is drenched in poison, one of a number of poisons common to dart frogs which prevents nerves from transmitting impulses, leaving the muscles in an inactive state of contraction. This can lead to heart failure. The average wild Golden Dart Frog is generally estimated to contain about one milligram of poison, enough to kill about 10,000 mice. This estimate will vary in turn, but most agree that this dose is enough to kill between 10 and 20 humans, which correlates to up to two African bull elephants. This is roughly 15,000 humans per gram.
Pygmy marmoset is one of the smallest primates, and the smallest true monkey, with its body length ranging from 14 to 16 centimetres (5.5 to 6.3 in) (excluding the 15-to-20-centimetre (5.9 to 7.9 in) tail). Males weigh around 140 grams, and females only 120 grams. They are found in the rainforest of western Brazil, south eastern Colombia, eastern Ecuador, eastern Peru, and northern Bolivia. Pygmy marmosets live 11-12 years in the wild, but in zoos, they live into their early twenties.
Threatened by both volcanoes and humans, the komodo dragon is endangered. At an average 10 feet and 330 pounds, it is the largest lizard in existence. They have poor hearing and cannot run very fast for very long, instead relying on their sharp eyesight and powers of stealth to hunt. It possesses serrated teeth and has nasty attack habits, preferring to jab at the feet or drag its prey along for a bit before finishing off the deed. If an animal is lucky enough to get away, it will soon die from massive infection thanks to the komodo’s specialized bacteria. Komodo will eat nearly anything, living or dead, including their young. They will also eat nearly their entire kill, even the intestines; although they do swing those around to expel the faeces. For this reason, baby komodo roll themselves in faeces to avoid being eaten.
The coconut crab is a species of terrestrial hermit crab, also known as the robber crab or palm thief. It is the largest land-living arthropod in the world at a weight of up to 4.1 kg (9.0 lb). It is found on islands across the Indian Ocean and parts of the Pacific Ocean. Adult coconut crabs feed on fruits, nuts, seeds, and the pith of fallen trees. The species is popularly associated with the coconut, and has been widely reported to climb trees to pick coconuts, which it then opens to eat the flesh.
The Goliath bird-eater is a spider, belonging to the tarantula family. It is considered to be the largest spider in the world by mass. These spiders can have a leg span of up to 30 cm (12 in) and can weigh over 170 g. They carry venom in their fangs and have been known to bite when threatened, but the venom is relatively harmless. Despite its name, the Goliath bird-eater does not normally eat birds. As with other tarantulas, their diet consists primarily of insects and other invertebrates.
The black mamba also called the common black mamba or black-mouthed mamba is the longest venomous snake in Africa, averaging around 2.5 to 3.2 m (8.2 to 10 ft) in length, and sometimes growing to lengths of 4.45 m. It is named for the black colour of the inside of the mouth rather than the colour of its scales which varies from dull yellowish-green to a gun-metal grey. It is the fastest snake in the world, capable of moving at 4.32 to 5.4 metres per second (16–20 km/h, 10–12 mph). It has a reputation for being aggressive and highly venomous and is among the world’s most venomous land snake.