Guardian Nature School Team Contact Blog Project Noah Facebook Project Noah Twitter

A global community of nature enthusiasts
photographing and learning about wildlife

Join Project Noah!
nature school apple icon

Project Noah Nature School visit nature school

water stick-insect or water scorpion



While the water stick-insect does resemble the terrestrial walking stick insect in many ways, the two are not at all closely related. They are both insects, of course, but that’s as close as they get, taxonomically. They are not only in different insect families, but completely different insect orders as well. In fact, they are more closely related to assassin bugs and ambush bugs, and use a similar strategy for subduing and eating their food. All three pierce their prey with sharp beaks and inject saliva that both paralyzes and liquefies the inside of the hapless creature. Water stick-insects feed on insects, but also tadpoles and small fish.


There are around 100 Ranatra species found in freshwater habitats around the world, both in warm and temperate regions, with the highest diversity in South America and Asia.


Ranatra is a genus of slender predatory insects of the family Nepidae, known as water scorpions or water stick-insects. Nepidae (order Hemiptera) a true bug

Species ID Suggestions

Sign in to suggest organism ID

No Comments

Finca Los Brazos
Spotted by
Finca Los Brazos

Provincia Guanacaste, Costa Rica

Spotted on Jan 30, 2020
Submitted on Mar 30, 2020

Noah Guardians
Noah Sponsors

Join the Project Noah Team Join Project Noah Team