Beavers are some of the great engineers of the wild kingdom. In Arizona, these toothy critters are hard at work along the Verde River, helping to restore this fragile river system to good health. They are creating dams and lodges that improve the habitat for otters, native fish and other species. People benefit as well because a healthy river system means good drinking water for the growing communities downstream.

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Thousands hold protest march in Colombia
Thousands of people have marched through the southern Colombian city of Tumaco in protest at a series of deadly attacks. Tumaco is one of a number of areas being targeted by bombs and mortars. At least 18 people have been killed. The government says Farc guerrillas are to blame. Al Jazeera's Tom Ackerman reports. From: AlJazeeraEnglish Views: 7 0 ratings Time: 01:46 More in News & Politics

S Korea to respond to violence in schools
A rise in case of violence in schools prompts the South Korean government to intervene with immediate affect. From: AlJazeeraEnglish Views: 82 1 ratings Time: 02:40 More in News & Politics

Violent crime soars in Brazil
Violent crime in one of Brazil's biggest cities is soaring as state police strike over pay. Al Jazeera's Gabriel Elizondo reports. From: AlJazeeraEnglish Views: 171 4 ratings Time: 02:15 More in News & Politics

Republican front-runner Mitt Romney cruised to an easy victory in Nevada on Saturday, crushing his three remaining rivals and taking firm command of the party's volatile presidential nominating race.

More than 100 Conservatives are among MPs who have written to the prime minister calling on him to slash subsidies for onshore wind turbines.

News Bulletin - 03:55GMT update
The main headlines on Al Jazeera English, featuring the latest news and reports from around the world. From: AlJazeeraEnglish Views: 168 4 ratings Time: 01:19 More in News & Politics

Prime Minister Julia Gillard has called on Labor MPs to show more discipline as speculation about her leadership continues to stalk the party.

Mandatory evacuations have been ordered for the southern Queensland town of St George as authorities predict the Balonne River to peak at up to 15 metres in a record flood.

Grassfires have broken out across country Victoria as the state experiences warm and windy conditions.

Federal Treasurer Wayne Swan says Australian banks should pass on a full rates cut if the Reserve Bank moves the mark lower.

oronto shuts down Ottawa 5-0 and closes the gap with Ontario rivals in NHL playoff race

The Victorian Government has been forced to pulp pamphlets aimed at problem gamblers which directed them to a phone line encouraging them to bet.

The peak motoring body in New South Wales says it is concerned by data that shows one-quarter of drug-affected drivers escape conviction and penalty.

Egyptian authorities say saboteurs have blown up a pipeline that supplies gas to Israel, the twelfth such attack in a year.

Cocaine, cannabis, a hunting knife, bayonet and soft body armour have been uncovered by police during a raid on a home in Sydney's south.

An intensive search is continuing in Roma for a woman whose car was washed off a flooded causeway on Friday.

In the first of a two-part series on modern robotics we look at so-called socially assistive robots and also explore why understanding dog behaviour could be crucial to the future of human-robot interaction.

A group of Australians is in Burma for one of the first major business and academic gatherings since the Asian nation reopened its borders.

Two Hells Angels bikies have been charged with intimidating police after a brawl in Kings Cross.