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It took a lot of courage for Bert Lahr to transform into the "King of the Forest."

The comic actor famously played the Cowardly Lion in 1939’s "The Wizard of Oz." The Technicolor classic, which featured Judy Garland, proved to be risky business for the veteran vaudevillian, the late star’s daughter told Fox News Digital.

The film turned 85 on Aug. 15.

‘BEVERLY HILLBILLIES’ STAR BUDDY EBSEN LOST 'THE WIZARD OF OZ’ ROLE FOR THIS HORRIFYING REASON, DAUGHTER SAYS

Close-up of Bert Lahr as the Cowardly Lion.

Bert Lahr is seen here as the Cowardly Lion in 1939's "The Wizard of Oz." (Getty Images)

"My dad was really tortured by the costume," said Jane Lahr. "It weighed almost 100 pounds. It was real lion fur, and it was hot. He couldn’t eat. He had to drink his lunch through a straw. The studios had wonderful dining rooms. He and Jack Haley, who played the Tin Man, had to lay down on boards because their costumes were so heavy, and they couldn’t eat in the dining room. Dad could only drink something through a straw."

Bert Lahr doing his makeup in front of his son.

Bert Lahr in his dressing room with his son John, circa 1947. (Keystone Pictures/FPG/Archive Photos/Getty Images)

"It wasn’t fun," said Jane. "They were not happy campers with these costumes, I’ll tell you that. But when the reviews came out, well, that was another story."

The hot studio lights would make the set feel like a sweltering 100 degrees as Lahr was in costume, according to reports. His tail was reportedly attached to a square block. The costume was paired with a wig made of Italian human hair, and the footwear was constructed out of a lion pelt, Bonhams revealed.

"My dad was really tortured by the costume. It weighed almost 100 pounds. It was real lion fur, and it was hot. He couldn’t eat. He had to drink his lunch through a straw."

— Jane Lahr, Bert Lahr's daughter
Jane Lahr posing next to her fathers Cowardly Lion costume.

Jane Lahr is seen here next to her father's costume on display. (Courtesy of Jane Lahr)

Lahr grumbled, but when cameras began rolling, he made light of the situation. It has been reported that the film required multiple takes because Garland – along with the rest of the cast and crew – burst into laughter.

Dorothy wiping the Cowardly Lions tears as the Tin Man and Scarecrow look on

According to reports, "The Wizard of Oz" required multiple takes because Bert Lahr often made the cast and crew laugh. (Authenticated News/Archive Photos/Getty Images)

"There’s a scene where the Lion chases Toto," said Jane. "Judy grabs Toto, slaps the Lion, and then the Lion starts to cry. Judy always broke up laughing. The director took her aside and slapped her, saying ‘You cannot do this.’ But in the movie, you can still see Judy putting the dog in front of her mouth because she is smiling… But it was a big problem because she would always laugh… I think it’s so fabulous."

According to Jane, "The Wizard of Oz" cost nearly $3 million to make. While Lahr received positive reviews for his performance, his co-star Frank Morgan, who played the Wizard, issued a warning.

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The cast of The Wizard of Oz looking serious.

From left to right, Bert Lahr as the Cowardly Lion, Jack Haley as the Tin Man, Judy Garland as Dorothy Gale and Ray Bolger as the Scarecrow in a scene from "The Wizard of Oz." (Metro-Goldwyn-Mayer/Getty Images)

"He said, ‘Bert, you’re going to get all the reviews and Judy will get all the reviews, but it’s not going to do you any good in Hollywood. There are no other lion parts,’" said Jane.

Morgan was right. Jane said that after the film premiered, MGM dropped her father’s contract.

A young Bert Lahr smiling at a woman wearing a striped suit.

Bert Lahr got his start in vaudeville before Hollywood came calling. (John Springer Collection/CORBIS/Corbis via Getty Images)

"It was a huge blow," said Jane. "My mom and dad had built their dream house, this beautiful house in Coldwater Canyon on an acre and a half. It was built by the first African American architect in the country. It was extraordinary. 

Bert Lahr with his family. sitting down at a restaurant.

Bert Lahr, left, at the iconic Stork Club in New York City with his wife and their two children. (Courtesy of Jane Lahr)

"It was their first home after living in apartments. They adored it. My dad loved gardening… He planted lime trees, apple trees, pear trees and avocado trees. But the house had to be sold. And we moved immediately to New York because Broadway was dad’s favorite medium. I was one and my brother John was three."

"My dad felt [Hollywood] wasn’t trustworthy," Jane continued. "He assumed after the movie came out, and he got all of these great reviews, that he’d be there forever making movies. But the truth is that his talent was too big for films. It was made for the Broadway stage. He had a huge voice.

John and Jane Lahr watching The Wizard of Oz

John and Jane Lahr are seen here watching "The Wizard of Oz" for the first time. (Courtesy of Jane Lahr)

"He went on to make a few movies over the rest of his lifetime, but it was nothing like ‘The Wizard of Oz.’… But he loved the stage. It’s where he felt the love from an audience. And it was his favorite form of acting."

In New York, Jane said she witnessed a new side to her father.

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A close-up of Bert Lahr with his wife and daughter.

Jane Lahr, right, described Bert Lahr as a loving father who was quiet and shy at home. (Courtesy of Jane Lahr)

"At home, my father was very shy, very quiet," she said. "He played solitaire. He did crossword puzzles. But on TV, he was this lion with a very big voice… He had that lion in him. And it made sense – my father was a Leo."

Jane saw "The Wizard of Oz" for the first time when she was 6 years old. However, it would not be until she was visiting from college that she sat down and watched it with her father.

Bert Lahr dancing with Jane Lahr

Bert Lahr seen here with his daughter Jane Lahr. (Courtesy of Jane )

"Dad never liked to watch himself," she said. "He was a perfectionist. Over the years, he wouldn’t watch the movie. But one day, I was alone with him, and it was playing on television, so we watched it together. He looked at me and said, ‘That was pretty good.’"

Jane Lahr wearing a white dress next to her father in a tux.

Jane Lahr and Bert Lahr watched "The Wizard of Oz" together in the later years. (Courtesy of Jane Lahr)

One role Lahr took great pride in was that of being a father. Jane described how, in college, Lahr would complain about her listening to the Beatles repeatedly, but secretly played them when she was away. When he overheard his daughter "treating a would-be suitor on the phone badly," he scolded her, warning, "In my neighborhood growing up, if you behaved that way with a guy, you’d end up in the East River with your feet in cement!"

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John and Jane Lahr smiling overlooking their fathers portrait.

Jane Lahr seen here with her brother John. Jane's brother wrote "Notes on a Cowardly Lion: The Biography of Bert Lahr," which was published in 1969. (Courtesy of Jane Lahr)

Jane vividly remembers her father not for being a movie star, but for being "kind and sweet."

One night in 1967, Jane had returned home from a date. She found her father sitting in a chair looking pensive. She went to her bedroom and opened a book. It opened up to a page about death.

Bert Lahr in a tux smiling

Bert Lahr kept busy pursing his love for performing until the end. (GArt Zelin/Getty Images)

"He was making a movie, ‘The Night They Raided Minsky’s,’" Jane explained. "He got sick on the set. He was always afraid of dying from cancer. And although they said he died of pneumonia, his doctor had tested him, and he had bone cancer. He was having trouble walking around that time too."

Lahr died on Dec. 4, 1967 in New York City. He was 72.

Jane Lahr posing as someone dressed as the Cowardly Lion

Jane Lahr is a familiar face at the annual Oz-Stravaganza. (Courtesy of Jane Lahr)

"I remember I wanted to get a Christmas tree for my mom," said Jane. "Dad said that year, ‘I don’t want a Christmas tree.’ Dad was Jewish, but we were brought up Catholic. Every year we had Christmas."

Bert Lahr smiling in a suit wearing a fedora.

Bert Lahr died on Dec. 4, 1967. He was 72. (Leonard Nones/Condé Nast via Getty Images)

"When he died, I thought it would cheer mom up, so I got a Christmas tree for her," Jane shared. "A few days later, I came back to the apartment and there was hardly a needle on that tree. Well, dad didn’t want a Christmas tree that year and mom didn’t get one."

"There were several other things that caused one to wonder about the immortality of the soul, let’s put it that way," she chuckled.

Jane recalled visiting her father’s gravesite with her brother. The siblings were stunned by what they saw.

SECOND SUSPECT CHARGED IN THEFT OF RUBY SLIPPERS FROM 'THE WIZARD OF OZ'

A lion by Bert Lahrs gravestone

Bert Lahr's gravestone with the toy lion that surprised John and Jane Lahr. (Courtesy of Jane Lahr)

"A child had put a toy lion by the gravestone," she said. "That touched me and John so much."

Today, Jane is determined to keep her father’s legacy alive. She’s often a guest at the annual Oz-Stravaganza, a festival that celebrates all things "Oz."

WATCH: ‘BEVERLY HILLBILLIES’ STAR BUDDY EBSEN LOST THE WIZARD OF OZ’ ROLE FOR THIS HORRIFYING REASON, DAUGHTER SAYS

"There are so many reasons why the film is still so popular," Jane explained. "Certainly, the music is extraordinary. The costumes, the sets, the stars – everything is kind of perfection when put together. And it came out just before World War II with a happy ending. It gave people hope. And then children started to play the parts in school… It became part of the fabric of America."

Bert Lahr spending time with his two young children.

Despite the heartwarming photo, "dad did not cook!" said Jane Lahr. (Jane Lahr)

When asked how she wants her father to be remembered, Jane said, "I just want him to be remembered."

"The way I remember him is this dear, sweet, thoughtful soul who loved to share his energy with an audience," she said. "He was someone who gave people pure and utter joy and laughter. That’s how he should be remembered."