The most poisonous animals on the planet - There are many dangerous animals, but if we're talking about poisonous species, spiders and snakes definitely rank higher than the rest.

Click through this gallery to see the full list of the most venomous animals on the planet!

© Shutterstock

Platypus - You may be surprised to find out that this weirdly cute animal is poisonous. According to National Geographic, the platypus has 'sharp stingers on the heels of their rear feet,' which they can use to intoxicate their victims.

© Shutterstock

Cobra - This snake's venom contains toxins that affect the prey's heart and nerves, often leading to cardiac arrest, according to the Daily Mail.

© Shutterstock

Mexican beaded lizard - According to National Geographic, this reptile can be found in Mexico and Guatemala. Because of the venom in its saliva, this lizard's bite can cause a human to suffer a respiratory arrest.

© Shutterstock

Brown recluse spider - This spider can be found in several places in the US, and its bite is extemely poisonous. According to Live Science, symptoms may include pruritus, fever, nausea and chills.

© Shutterstock

Yellow-bellied sea snake (Aipysurus duboisii) - This snake lives in the sea and can be found in Australia. According to The Guardian, these snakes are extremely venomous but they're not aggressive.

© Shutterstock

King brown snake - According to Australian Geographic, this is Australia's heaviest poisonous snake. In just one bite, this animal can release 150 mg of venom, which destroys blood cells and affects muscles and nerves.

© Shutterstock

Banana spider - According to Live Science, this is one of the most poisonous spiders in the world, and its bite can be lethal to humans.

© Shutterstock

Saw-scaled viper - According to BBC, this viper has such a toxic venom it is considered one of the most dangerous in southern Asia. It usually hides in the sand.

© Shutterstock

Catfish - A bite from this fish is extremely painful, although rarely ever deadly. According to National Geographic, the catfish uses its venom as a defense mechanism as opposed to a way of attacking.

© Shutterstock

Taipan - This snake can be spotted in several places in Australia. According to the Australian Geographic, they become fierce when they feel trapped or under threat. In the worst cases, one bite can kill the victim in 30 minutes.

© Shutterstock

King cobra - According to National Geographic, this snake's venom isn't the most powerful among all cobras. However, the amount of neurotoxins present in one bite could kill up to 20 people.

© Shutterstock

Black widow - National Geographic says this spider's venom is 15 times stronger than a rattlesnake's. Its bite can cause nausea, muscle pains and diaphragm paralysis.

© Shutterstock

Conus - This cone snail has in its shell enough venom to kill a human. According to BBC, it feeds off mollusks, worms and fish that it hunts with its spears, which hold over 200 types of toxins.

© Shutterstock

Funnel web spider - This is Australia's deadliest spider and it builds funnel-shaped webs. Its venom is so toxic it can kill in just 15 minutes, according to The Sun.

© Shutterstock

Stinging stonefish - This fish has 13 venomous spikes on its back, and according to Australian Geographic, 'the pain of a sting alone can be lethal.'

© Shutterstock

Lionfish - This fish's venomous spikes aren't deadly but they can cause extreme pain, according to National Geographic.

© Shutterstock

Cascavel crotalus - Commonly known as rattlesnake, this species hates human contact but only attacks when it's being threatened. Its venom kills the victim's red blood cells and causes tissue damage, according to National Geographic.

© Shutterstock

Deathstalker - According to website Scorpions World, this animal's venom contains several neurotoxins and cardiotoxins, which can cause serious cardiovascular and respiratory dysfunction, especially for sick or allergic people.

© Shutterstock

Gila Monster - Its bite isn't fatal for humans, yet it is very painful and can cause heavy bleeding and a drop in blood pressure, according to National Geographic.

© Shutterstock

Fat-tailed scorpion - According to Scorpions World, there are around 18 different species of fat-tailed scorpions. Their venom can be deadly for humans, especially if they already suffer from any health problem. The poison attacks the victim's central nervous system, which causes paralysis and respiratory failure.

© Shutterstock

India's Russell's viper - According to a National Geographic article, this snake is responsible for the death of thousands of people in India, even though its venom isn't one of the most toxic.

© Shutterstock

Krait - According to National Geographic, it is estimated that half of the people who have been bitten by this snake died. The bite itself doesn't hurt, but the venom is extremely toxic.

© Shutterstock

Boomslang - The Boomslang has the most toxic venom among all the South African snakes. There have been rare situations in which they bite people, but they tend to be 'shy' and avoid contact, according to the Highway Mail.

© Shutterstock

Escorpião vermelho - According to National Geographic, this scorpion is the deadliest in the world. However, it usually only bites as a last resource.

© Shutterstock