Did you know that there are a group of frogs in South America known as 'poison-dart frogs'? There are different types of frogs within the group but most of them are brightly coloured and have black spots. They are dangerous to touch because they have poison on their skin. Native people in the area used to rub the poison onto their arrows before hunting.
Human digestion
Human digestion Many of the drugs that humans take survive the
digestive system and are passing through sewage works into rivers
and seas. Scientists believe that these drug pollutants are
responsible for the deaths of many tiny aquatic organisms. Some of
the drugs have also been found to alter spawning patterns in
different types of marine species. 10 MAY 2000
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