Flowerhorn cichlids are aquarium fish prized for their bright-gold colour and prominent head humps. Photograph: Lillian Suwanrumpha/AFP/Getty Images A human-bred aquarium fish prized for its bright gold colour and distinctive head hump has escaped into a volcanic crater lake in the Philippines, where scientists fear it is threatening native wildlife and spreading into local aquaculture.Flowerhorn…

Long before crops were planted or livestock were kept, people living in what is now southern Norway were already making lasting changes to the natural world around them. High in the mountains, where lakes lay beyond the reach of naturally migrating fish, communities appear to have carried brown trout into isolated waters and created places…