According to a national study, in the summer of 2013, the long-term  warm weather in the UK has made the number of butterflies increase. Around 46,000 volunteers  took part in the year's Big Butterfly Count , and they found 830,000 butterflies.Volunteers were asked to make a record.They would record how many times they found one of 21 different kinds of butterflies. Later, the scientists used the records to find out how many butterflies of different kinds were found across the country.Then, they compared the results to the year before.They found that there was a rise in the number of 15 kinds of butterflies, and some of them went up by 50% compared to recent years.They said the increase in butterfly numbers was a result of warm weather. However, scientists also said that the number of butterflies was in decline  as a whole, and that we might not see _ the next year. Richard Fox, who works for Butterfly Conservation, said, "UK butterflies are in long-term decline.Studies have been done since the 1970s.They show that UK butterflies have declined in type and number." He added, "We must _ the long-term decline of these beautiful creatures .The only way is by stopping the damage that has been done to the butterflies' habitats  across the UK." The volunteers were asked to   _  .
study 830,000 butterflies help scientists take notes record the number of each kind of butterfly find how many kinds of butterflies there are