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Articles on Alien species

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Do aliens exist? We asked five experts

Even if aliens exist, are intelligent like humans and interested in making contact with us, what are the chances they’ll be close enough for us to hear them screaming their presence into the cosmos?
Boa constrictors are frequently found at large in Australia, despite being banned. Marcos André/flickr

Alien invaders: the illegal reptile trade is a serious threat to Australia

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.

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