Compared to the ease of eating plants, they’re going to quite a lot of trouble. Today’s situation report starts with what is undoubtedly one. Gerlach added: “It’s clear that they enjoy eating terns. First-person view drones are making a big impact on the battlefield, with a Russian Bukhanka van being one of their latest victims. After visiting a number of islands in the chain, Darwin realised that each island had its own, distinct species of giant tortoise. Naturalist Charles Darwin’s encounters with giant tortoises in the Galápagos Islands were key to the development of modern understandings of evolution. Gerlach said the video could be evidence of a “population of tortoises that is developing a new type of behaviour with evolutionary implications”, but added that the revival of seabird and tortoise populations may also have “recreated conditions for natural behaviours that people haven’t seen for hundreds of years”. But our observation highlights that when ecosystems are restored, totally unexpected interactions between species may appear – things that probably happened commonly in the past but we’ve never seen before.” Gerlach said: “These days, Fregate Island’s combination of tree-nesting terns and giant tortoise populations is unusual. On the Galápagos and Seychelles islands, giant tortoises are the largest herbivores and eat up to 11% of the vegetation. But scientists said the way the Seychelles giant tortoise approached the chick on the log suggested this type of interaction happens frequently. In most places, potential prey are too fast or agile to be caught by giant tortoises. Previously all tortoises were thought to be vegetarian – although they have been spotted feeding opportunistically on carrion, and they eat bones and snail shells for calcium.Įxtensive habitat restoration on the island has enabled seabirds to recolonise, and there is a colony of 265,000 noddy terns that leave the ground “littered with dropped fish and chicks that have fallen from their nests”. Researchers think this new hunting behaviour has been driven by the unusual combination of a tree-nesting tern colony and a resident giant tortoise population on Seychelles’ Fregate island. He said: “This is completely unexpected behaviour and has never been seen before in wild tortoises.” The Seychelles giant tortoise is a member of the species Aldabrachelys gigantea, which are “generally assumed to be strict herbivores”, according to a study published in Current Biology.ĭr Justin Gerlach, the director of studies at Peterhouse, Cambridge, and an affiliated researcher at the University of Cambridge’s Museum of Zoology, led the study. Other tortoises in the area have been seen making similar attacks but no tortoise species has been seen actively pursuing prey in the wild before. The privately owned Fregate Island is managed for ecotourism and home to about 3,000 giant tortoises.
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