The American red swamp crayfish was intentionally introduced to parts of Africa to control snails and as a pet.
Developing countries have been slow to react to the alien species problem. Its impact can be massively reduced if policies are developed to deal with the issue.
The larger grain borer beetle attacks crops like maize and cassava, threatening food security.
Many alien plants and animals have been introduced to Africa from other regions and spread from country to country, often having devastating effects.
Should we make contact with alien life?
We continue to search for intelligent life elsewhere in the universe. But if we find ET there are those who question whether we should make contact or not.
Boa constrictors are frequently found at large in Australia, despite being banned.
Keeping non-native reptiles as pets is against the law – with good reason. Alien species traded on the black market can potentially establish themselves in the wild if they are released or escape.