Darwin's finches are about 18 species of birds that live on the Galápagos Islands, and one ancestral finch species likely arrived there more than a million years ago. Their beaks differ most between species, ranging from tiny warbler-finch bills to the large beak of the vegetarian finch. Each shape suits a particular food, such as seeds, insects or plant material. Because food supplies on different islands varied, and droughts could shift them quickly, birds with better-fitting beaks survived and reproduced more. This process of one ancestor splitting into many specialised forms is called adaptive radiation.

Israeli reports also say the cabinet directed the military to prepare for a possible new attack on Iran.

Angkor, near Siem Reap in northern Cambodia, was the capital of the Khmer Empire, which ruled much of mainland Southeast Asia between roughly the 9th and 15th centuries. At its height the city spread across about 3,000 square kilometres, making it the largest pre-industrial city on Earth by area. Its growth depended on water: huge reservoirs called barays, along with canals and embankments, stored monsoon rain and carried it to rice fields. That system let farmers harvest more than once a year and fed a very large population through the dry season. The temple complex of Angkor Wat, built in the early 12th century, is the best-known monument and still stands at the heart of the park.