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"The course of true love never did run smooth," according to Shakespeare in A Midsummer Night's Dream. Boy, was he right. There are all sorts of obstacles to a successful relationship, but perhaps there's none bigger than our tendency to lie all the time. Animals are just as deceitful towards their lovers. The drive to attract a mate, make sure no one else gets near them, and have offspring has driven animals to get up to all sorts of trickery. A pair of brown salmon (Salmo trutta) spawning  Take a female brown trout . Males court her by quivering their trunk muscles, and the most powerful will drive off all the others. While this is going on, the female digs a small bed in the river bottom for her eggs. Then she starts quivering. It looks like she is going to lay eggs, so the male quivers furiously and releases his sperm. But the female does nothing. She has faked it. It's not clear why the female does this. She might be holding back until more males arrive, ei

The birds, the bees, chimpanzees, humans – we all do it, but few people realise that sexual reproduction actually first evolved in creatures vastly different to ourselves. So what were they and how did it all start? What is the real story of the birds and the bees? What is the real story of the birds and bees? The dawn of sexual reproduction has always been a puzzle for scientists. Today on Earth 99% of multicellular creatures – the big organisms we can see – reproduce sexually. All have their unique mechanisms, but why this process evolved is actually a subject of great mystery. Even for Darwin, the father of evolution, sex was confusing Even for Darwin, the father of evolution, sex was confusing. He wrote in 1862: "We do not even in the least know the final cause of sexuality; why new beings should be produced by the union of the two sexual elements. The whole subject is as yet hidden in darkness." Many species are totally preoccupied by sex and will go to great lengths

Image copyright Image caption Five men came forward to say they were Prince's father A judge in the US state of Minnesota has dismissed claims by 29 people who said they were owed a share of Prince's inheritance. The singer died in April from an accidental overdose of the painkiller fentanyl, but he did not leave a will and did not have any children. Reports in Minnesota say his estate may be worth at least $300m (£227m). A judge has now ordered genetic tests to be carried out on six people with claims to be relatives of the singer. Four siblings or half-siblings, as well as two women believed to be a niece and a grand-niece, will be tested. Genetic tests had already ruled out the claim of a man in jail in Colorado who said he was Prince's son. And, as part of the latest ruling, Judge Kevin Eide decided a claim by a Georgia woman, who said she and Prince were once married, was not valid. She had said the CIA was keeping their marriage record secret.

This little-known delicacy from Serbia, made with milk believed to slow down the ageing process and boost virility, is the most expensive cheese in the world. Slobodan Simić lounged on the crude wooden bench in Zasavica Special Nature Reserve’s dining room like the caterpillar from Alice’s Adventures in Wonderland, holding court and puffing on the quarter-bent Calabash-style briar pipe that dangled delicately from his teeth. Tanned creases ran down his face like tributaries, and his eyes sparkled with mischief. “Rakia?” he said, offering me a shot of the strong Balkan brandy that is often drunk in the morning, even before coffee. “Ne, hvala,” I replied, shaking my head and thanking him. Instead, I accepted a cup of thick Turkish coffee accompanied by a shot glass of donkey milk from Zasavica’s herd. It was my first time tasting the sweet milk; I was even more eager to try the donkey cheese, a delicacy I’d learned about a few years back when rumours swirled that Serbian tennis

Many social insects have soldiers, but only one bee does – and Jatai bee soldiers are unlike any other soldier caste biologists have ever seen On the campus of the University of Sao Paulo, Brazil, some trees buzz more than others – which is exactly what behavioural ecologist Francisca Segers had hoped for. She approaches one buzzing tree. There is a short wax tube extending from a hole in the trunk. Hovering around the opening are half a dozen small yellow-and-brown bees, the source of the gentle buzz. Next, Segers reaches into a box she is carrying and takes out a tiny black lump. It is the crushed head of a robber bee ( Lestrimelitta limao ), freshly killed that morning. She gingerly places the robber bee head on the tube opening, and watches as it slowly rolls down the tube into the tree. In an instant, a cloud of the tiny yellow-and-brown bees bursts from the tube. "It was just six bees flying at the entrance… then suddenly there were two hundred," says Segers. These a

"Save the Children have said the bomb hit the entrance to the hospital", reports Yogita Limeya The charity said several babies were hurt when incubators crashed to the floor, a pregnant woman lost a leg and two others suffered shrapnel wounds. An air strike has hit a maternity hospital supported by Save the Children in north-western Syria, killing two people and wounding others. Images show part of the building in Kafer Takhareem destroyed. It is not clear who carried out the attack. The air strike hit the entrance to the hospital in rural Idlib province. Syria Relief, the aid agency that manages the hospital, said those killed were relatives of patients. Save the Children said the hospital was the biggest in the area, carrying out more than 300 deliveries a month. At the time of the bombing, two operations were under way and a woman was in labour, a statement said. Image copyright Image caption The air strike in Idlib caused widespread damage The hosp