A Sponge is a tool that is used for cleaning and washing. The sponge is made of a special material, with many holes. By rubbing the sponge against dirty surfaces, the dirt can be removed.
Today, there are also artificial sponges.
An artificial sponge, made of polyurethane
A natural sponge. This is the skeleton of a sponge from the Demosponges
Natural sponges for cleaning[change | change source]
Other qualities of natural sponges[change | change source]
Antibiotic compounds[change | change source]
Dolphin use sponges[change | change source]
Bottlenose dolphins have been seen using live sponges. This was in Shark Bay. Shark bay is in Western Australia. The behaviour has only been observed in the bay. Most likely adult dolphins teach it to their children. The only other marine mammals that use tools are Sea otters.
References[change | change source]
- See, for example Teeyapant R, Woerdenbag HJ, Kreis P, Hacker J, Wray V, Witte L, Proksch P. (1993) Antibiotic and cytotoxic activity of brominated compounds from the marine sponge Verongia aerophoba. Zeitschrift für Naturforschung. C, Journal of biosciences 48:939-45.