Background: Hedren was born on January 19, 1930, in New Ulm, Minnesota, to Bernard Carl and Dorothea Henrietta (nee Eckhardt) Hedren. For much of her career, Hedren's year of birth was reported as 1935. In 2004, however, she acknowledged that she was actually born in 1930 (which is consistent with the birth registration index at the Minnesota Historical Society). Her paternal grandparents were Swedish immigrants, while her maternal ancestry is German and Norwegian.
Context: In 1981, Hedren produced Roar, an 11-year project that ended up costing $17 million and starring dozens of African lions. "This was probably one of the most dangerous films that Hollywood has ever seen", remarked the actress. "It's amazing no one was killed." During the production of Roar, Hedren, her husband at the time, Noel Marshall, and daughter Melanie were attacked  by lions; Jan de Bont, the director of photography, was scalped. Hedren later co-wrote Cats of Shambala (1985) about the experience. Roar made only $2 million worldwide. Hedren ended her marriage to Marshall a year later in 1982. The film directly led to the 1983 establishment of the non-profit Roar Foundation and Hedren's Shambala Preserve, located at the edge of the Mojave Desert in Acton, California, between the Antelope Valley and the Santa Clarita Valley 40 miles (64 km) northeast of Los Angeles. Shambala houses some 70 animals. Hedren lives on the Shambala site and conducts monthly tours of the preserve for the public. In a 2015 interview with ABILITY Magazine, Hedren emphasized that there is no human contact with the animals and that all of the cats are spayed and neutered, since they are being raised in captivity.  She took in and cared for Togar, a lion that belonged to Anton LaVey, after he was told by San Francisco officials that he couldn't keep a fully grown lion as a house pet. Shambala became the new home for Michael Jackson's two Bengal tigers, Sabu and Thriller, after he decided to close his zoo at his Neverland Valley Ranch in Los Olivos. Thriller died in June 2012 of lung cancer.  On December 3, 2007, Shambala Preserve made headlines when Chris Orr, a caretaker for the animals, was mauled by a tiger named Alexander. Several documentaries have focused on Shambala Preserve, including the 30-minute Lions: Kings of the Serengeti (1995), narrated by Melanie Griffith, and Animal Planet's Life with Big Cats (1998), which won the Genesis Award for best documentary in 1999. The animals at the preserve served as the initial inspiration for the life's work of artist A.E. London, who started her career working for Hedren.
Question: What were they attack by?

Answer:
lions;