Newspaper headlines: New Brexit rows and what's happened to Percy Pigs?

Many of the papers feature front page pictures of the protests on the streets of Venezuela.

The Financial Times has a striking image of a middle-aged man in a suit throwing a tear gas canister back to soldiers, who fired it at a group of civilians.

The Times has a photograph of a shirtless protester, who appears to have been shot by a rubber bullet. The paper says armoured vehicles ploughed into anti-government demonstrators in Caracas - causing serious injuries. It describes Juan Guaidó's call to action as "his boldest and most risky move" since he declared himself the country's president in January.

The Daily Mail says Mr Guaidó has called on Venezuelans and the armed forces to back him in mass street protests today to mark May Day.

Meanwhile, Brexit is back on the front pages with the Guardian reporting Jeremy Corbyn is facing a backlash after blocking calls for Labour to unequivocally back a new referendum.

The paper notes that the wording of the party's policy in its European election manifesto "falls well short" of the position set out recently by the deputy leader, Tom Watson, and the shadow Brexit secretary, Sir Keir Starmer.

The website of the New Statesman says Labour has avoided a civil war - after the party's ruling body agreed the compromise position. It concludes that the National Executive Committee "has agreed to keep disagreeing".

The Daily Telegraph reports that Eurosceptic ministers fear that Theresa May is about to "cave in" to Labour demands on Brexit.

It says the prime minister's announcement that she wants to end the cross-party talks next week, has added to suspicions she is waiting until after this week's local elections before announcing a climb-down.

The paper says the Chief Whip, Julian Smith, is understood to have told Cabinet ministers it was "time to get real", as they were presented with a document setting out the risks of holding another Brexit vote without Labour support.

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The front page of the Daily Mirror features a death threat sent to wildlife presenter Chris Packham.

The letter describes him as "a nasty piece of work" and states "we want you dead" after he led a campaign to stop wild birds being shot.

The Springwatch host tells the paper he will not be silenced or swayed from his cause, adding that "there are too few people fighting to protect our environment".

With many papers reporting on the success of a campaign to tackle childhood obesity in Leeds, the Times considers an inspiration for the scheme.

It says that what it calls "extreme measures" in the city of Amsterdam have paid off, with children banned from taking fruit juice or other soft drinks into school, where only tap water is allowed, and there is a ban on cakes and sweets in the classroom.

The Daily Express has a report about how traces of drugs - both legal and illegal - are finding their way into Britain's waterways.

The paper says some of the highest levels of over-the-counter medicines, such as ibuprofen and paracetamol, recorded anywhere in the world have been found during a year-long study of the Humber estuary.

Tests revealed traces of cocaine in 100% of samples and the paper says the findings have raised concerns that the drugs are being ingested by aquatic and marine life.

Finally, the Sun claims that Marks & Spencer has been accused of "killing Percy Pig" - by quietly turning all versions of the popular sweets vegetarian.

It says the retailer has stripped the treats of gelatine, leading to accusations that they are now "disgusting" and taste "like washing-up liquid".

A spokesman for M&S tells the Sun customers have been asking for the move and that "the flavour is the same".