US pop singer Pink has backed down from her call to boycott Australian wool over animal cruelty claims, admitting she failed to fully research the issue. The singer, who has sold around 200,000 tickets for dozens of shows in her upcoming April tour of Australia, appeared in an animal rights group video last year branding the practice of sheep mulesing "sadistic". But today, Pink admitted she was misinformed about the issue and had failed to do enough research. "I probably could have done a lot more researched on my own," she said on Channel 9. "That's the lesson I'm taking...