user: Generate an appropriate single-sentence summary for the given text such that it includes the main topic of the text.

Example Input: By Mark SavageBBC music reporter They said they were still weighing up the best way to stage the show, and were being "determined but realistic". Contestants have already been asked to produce a "live-on-tape" performance ahead of the competition. The videos will be used if artists cannot travel due to the pandemic, or are forced to quarantine at the venue. The 2021 Song Contest will still take place in Rotterdam after the Netherlands won the competition in 2019 with Arcade. Last year's event was cancelled because of the pandemic. "The Eurovision Song Contest will definitely make its welcome return this May despite the pandemic but, in the prevailing circumstances, it is regrettably impossible to hold the event in the way we are used to," executive supervisor Martin Österdahl said. Who is competing? All 41 countries who were scheduled to compete in 2020 will return, as will many of the contestants who were supposed to take part last year. However, all artists will be required to perform a different song. Returning entrants include Ireland's Lesley Roy and Iceland's Daði Freyr, who was tipped as a potential winner. The BBC has yet to reveal who will represent the UK, but last year's contestant, James Newman, has previously said he is keen to return. "I've said that I want to do it," he told BBC Radio 1 last year. "For me, it's like I want to finish what I started." What happens next? Last year, Eurovision announced four "scenarios" for how the contest could take place, ranging from a full-scale arena show with an audience, to a virtual event. On Wednesday, Eurovision announced that "scenario A", which would have involved "a packed venue", had been ruled out. Scenario B means there could still be a socially-distanced show, with a reduced audience and participants performing in Rotterdam's Ahoy arena. Strict health and safety measures, including frequent Covid testing, would be in place. For scenario C, all performances will be played "live-on-tape" with presenters helming the show from Rotterdam. Interval acts would also play live from the arena to a reduced audience. The final option would be for a fully-virtual contest, with no audience. Organisers say they are currently "focusing their efforts" on option B "while realistically keeping downscaling options on the table for the weeks to come". Follow us on Facebook, or on Twitter @BBCNewsEnts. If you have a story suggestion email entertainment.news@bbc.co.uk. Around the BBC BBC - Eurovision
Example Output: Eurovision Song Contest organisers have ruled out a full live show without social distancing when this year's event is staged in May.

Example Input: Staff at the attraction, which is closed for refurbishment, discovered the yellow-bellied terrapins in an empty chocolate box. They named the pair Jingle and Belle and put them in a tank at the centre. Curator Carey Duckhouse said the terrapins were lucky that staff members had discovered them. She added: "They're both really cute and happily their ordeal doesn't seem to have caused them any harm. "Leaving two turtles outside in the middle of winter is never a good idea though, if no one had found the container, they would probably have died. "It seems that all too often people buy terrapins and other species from pet shops without realising how much care they need or how big they can grow."
Example Output: People are being warned of the dangers of abandoning unwanted pets after two terrapins were dumped outside the Brighton Sea Life Centre.

Example Input: By Mark KinverEnvironment reporter, BBC News Researchers say the noise could stop adult birds hearing the hunger calls from their dependent offspring. In their study, the team found that birds nesting in noisy areas were less effective at feeding their chicks as those that nested in quieter places. The findings have been published in the journal Plos One. Scientists from the University of Sheffield reached their conclusion after carrying out a study on Lundy, a 445-hectare (1,100-acre) island located 19km (12mi) off the North Devon coast. Co-author Julia Schroeder explained that the project happened more-or-less by chance. "When I first went to the island, which is very remote and quiet - apart from gulls and shearwaters - I entered a barn and it was very loud," she recalled. The barn contained an electricity generator, yet sparrows were still choosing to nest in the building, so Dr Schroeder wondered whether the conditions affected the songbirds. "I found that there was a reduced fitness - a reduced reproductive output from the nest boxes located in the noisy area," she told BBC News. So she decided to test her findings against classic hypotheses on how noise could affect birds. "The main hypothesis regarding breeding output is that it affects mate choice decisions," she explained. Steep decline However, the study's findings did not fit the existing hypotheses. "In our case, we saw that the birds did not feed the chicks as well as the birds in the quiet area - this was a novel idea that had not been shown before," Dr Schroeder said. "Obviously, chick provision is strongly linked to chick survival because if they do not get fat then they die." Noise seemed to interrupt the communication between the young birds and their parents. "The only difference we found from normal behaviour was in the provisioning behaviour," she observed. "Chicks that were reared in the noisy barn were lighter when they fledged. "So this is why we have said that we think that the provisioning behaviour of females is a factor." Between the mid-1970s and 2008, the UK's sparrow population declined by 71% - with some of the sharpest declines occurring in towns and cities. Dr Schroeder and the team suggested that the noise from the generator on Lundy was comparable to car noise in urban areas. "There are lots of studies on great tits and urban noise, but these tend to focus around mate choice, where the male advertises its quality to the female. "But the idea that the communication between parents and offspring could be affected in cities is fairly new." In 2007, another study by researchers at the University of Sheffield published in Biology Letters found that urban-based robins were choosing to sing and communicate at night in order to avoid noise during the day. Until then, it had been thought that birds were singing at night because they were being disturbed by light pollution. Dr Schroeder added that it could be that other songbird species could also be affected in a similar way as the sparrows on Lundy. She observed: "Many songbirds communicate in a similar way so it is possible that other species could be affected too."
Example Output:

assistant: Noise in urban areas could be increasing the mortality rate among young house sparrows, a study has suggested.