7 small creatures but deadly

Irukandji fleas, mosquitoes or jellyfish are three of the small animals, but release dangerous toxins or spread deadly disease.

Small but dangerous creatures

Small frogs with vivid colors in nature are often a warning sign of danger.Indigenous people in Central America and South America use toxins secreted from their skin to poison darts while hunting.The only species is the golden poison frog.Each frog only has a size of 3.8 cm but has enough toxin to kill 10-20 people.(Photo: Shutterstock)

The Glossina fly has a hose used to suck on large vertebrate animals (including humans).They are intermediate animals that transmit trypanosomiasis, also known as sleeping sickness, which causes the body to become depressed and swollen.Scientists estimate that up to 300,000 people are infected with the disease.(Photo: Wikimedia Commons)

The blue-spotted octopus, though only about 5 cm in size, is one of the world's most toxic creatures.They are very gentle, but will bite if excited or someone stepped on them on the beach.(Photo: Flickr)

Fleas are small, wingless parasites and often suck blood from other animals.Fleas can spread plague.It once caused one of the most terrible pandemics in human history, also known as "black death".Bubonic plague is no longer popular today, but every year there are between 1,000 and 2,000 cases of infection worldwide.(Photo: CDC)

Indian red scorpion is considered the most dangerous scorpion in the world.They are only about 50-90 mm in size.If you're traveling in India, Pakistan, Nepal or Sri Lanka, check your shoes before you leave because they can hide in them.(Photo: Flickr)

List of deadly mosquito-related diseases including: malaria, yellow fever, dengue, encephalitis, West Nile virus and many other dangerous diseases.(Photo: JJ Harrison / Wiki Commons)

Irukandji jellyfish is the smallest jellyfish in the world (volume not more than one cubic centimeter), living mainly in waters off Australia.Irukandji jellyfish can produce venom 100 times stronger than cobra and 1,000 times that of large black spider in Southern Europe.(Photo: Wikimedia Commons)