This Giant Rat Can Crack Coconuts With Its Teeth

After years of searching, scientists have discovered a new species of rats in the Solomon Islands. Called Uromys vika, it is pretty big at about 18 inches in size, lives in trees and has teeth strong enough to crack coconuts.

Tyrone Lavery, a mammalogist who made the discovery along with John Vendi and Hikuna Judge, first heard about the elusive animal in 2010, when he visited the Melanesian country for the first time and met with locals from Vangunu Island who told him about a large tree-dwelling rat native to the island. The locals called it vika. Lavery looked for the giant rat since he first heard about it but years of searching led to nothing.

Explaining one of the reasons that made the search difficult, Lavery said in a statement Wednesday: “If you’re looking for something that lives on the ground, you’re only looking in two dimensions, left to right and forward and backward. If you’re looking for something that can live in 30-foot-tall trees, then there’s a whole new dimension that you need to search.”

This is a skull of new rat species Uromys vika. Photo: Tyrone Lavery, The Field Museum

The actual discovery of U. vika, named after the local name for the animal, was almost serendipitous. One of them was seen scurrying out of a tree that had been felled.

“As soon as I examined the specimen, I knew it was something different. There are only eight known species of native rat from the Solomon Islands, and looking at the features on its skull, I could rule out a bunch of species right away,” Lavery said in the statement.

Comparison of DNA from the specimen with genetic material from its relatives on the island and looking at other similar species in museums, Lavery had the evidence he needed to verify that U. vika was indeed a previously unknown rodent species.

The black rats that are commonplace in urban areas in Europe and the United States usually weigh less than half a pound, while U. vika weighs as much as 2.2 pounds. They haven’t been seen cracking coconuts so far (that is something the islanders told Lavery about vika’s behavior), but they do chew circular holes through the shells of nuts to get at the flesh inside.

These are nuts bearing the characteristic tooth-marks of Uromys vika. Photo: Tyrone Lavery, The Field Museum

The Solomon Islands is about a thousand miles northwest of Australia and is biologically isolated. Consequently, over 50 percent of mammals found on the islands that make up the country are not found…

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