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How 'Flora & Ulysses' transformed a squirrel into a superhero while 'keeping it squirrel'

The time has come for even the common squirrel to step up into movie superhero stardom.

In "Flora & Ulysses" (streaming Friday on Disney+), young human Flora (Matilda Lawler) saves a squirrel's life, only to find the food-crazy mammal, dubbed Ulysses, has extraordinary powers. 

It was a tough nut to keep the squirrel grounded in some sense of reality – in keeping with the character from the beloved Newbery Medal-winning 2013 children's book "Flora & Ulysses" – while also making Ulysses a bona fide hero with powers of flight, the ability to comprehend humans and the desire to fight injustice.

"I wanted Ulysses to be a legit, hard-core force of nature," says director Lena Khan. "It had to be like, 'I can buy into this superhero.' "

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Ulysses the squirrel takes flight in Disney+'s "Flora & Ulysses."

The squirrel family has already received major PR boosts with viral internet moments showing off their remarkable physical powers – such as YouTuber Mark Rober's backyard Ninja Warrior squirrel obstacle course and a Reddit phenom featuring photos of the critters in a three-point squirrel stance, suggesting an awesome Iron Man landing.

That power pose really stuck with Khan during her research for the family comedy. Ulysses assumes the position after his first flight and on the film's poster.

"You see Spider-Man and it’s all about how he looks when he’s hanging from a pole," she says. "So that three-point landing is one of the movie's key positions. And squirrels do that pose."

Squirrels strike the posture when grooming in a still position, not when touching down, says Mikel Delgado, an animal behaviorist at the University of California, Berkeley. All four legs are needed for landing from often-impressive jumps and other breathtaking acrobatics.

"Squirrels are physically amazing," says Delgado. "When you think about what they have evolved to do, they are leaping from tree to tree without touching the ground. Their true superpowers are navigating through trees, along with burying seeds and remembering where they buried them."

"Flora & Ulysses" filmmakers initially considered incorporating real squirrels, visiting an animal training facility for an exploratory audition. "They jumped on me, they climbed, they did flips," says Khan. "But they couldn’t do everything we wanted for Ulysses."

Ulysses makes a heroic landing after flying through the air. Real squirrels strike the same pose -- when scratching.

The filmmakers decided to go computer-generated and mulled more than 200 squirrel species for the coveted role. Khan turned down the ubiquitous gray squirrel ("Doesn't look like he’s going to go saving people") and the black squirrel common in Canada ("Doesn’t have the pizzazz").

The star-making part went to the Eurasian red squirrel and its tell-tale fur-plumed ears. 

"He's a unicorn among horses, with a physique that befits a superhero. The red squirrel shows that and Ulysses' savvy personality," says Khan.  "And I wanted those Batman ears."

The red squirrel was scaled up for size and had to be revised after the initial design: The original Ulysses was too fond of food. The squirrel was sent to boot camp.

"Earlier designs made him a little bit too chubby. (We wanted) Ulysses after he's worked out and trained for the role," Khan says of the final concept art. "There’s a lot of fatty squirrels, but we couldn’t let our squirrel be like that. He's got some muscles."

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"This is Ulysses after he's worked out and trained for the role," says director Lena Khan of concept art for the superhero squirrel. "He has a hint of the muscularity that we would definitely expand upon once we got to the CGI build." Khan points out that the squirrel "has a certain amount of heroic focus in his eyes." Either that, or there's a doughnut nearby.

Creating the hero squirrel was a months-long process for the Los Angeles Framestore studio that outlasted filming. The film's actors played off formless puppets standing in for Ulysses, but were aided by handling real rodents. Lawler worked with domesticated rats to get used to dealing with her character's squirrel BFF.

"Matilda would take them home and care for them," Khan says of the rats. "They gave an idea of what it was like to care for live animals and helped her get used to the way a live critter crawls up your arms. That helped her performance."

Veteran voice actor John Kassir, who chittered as the raccoon Meeko in Disney's 1995 animated film "Pocahontas," was daunted voicing his first screen squirrel, without human words. "Ulysses is carrying the movie. You needed this character to come to life – all while walking the line between communicating to humans and still keeping it squirrel," he says.

Relying on his own experience observing the critters around his home, Kassir threw out what became "squirrel jazz" in the studio, bridging the gap between human emotions and realistic squirrel sounds. Khan loved it, especially his squirrel munching.

"Ulysses eats with a tremendous amount of satisfaction, and if ever someone could find 10 different ways to eat in squirrel language, John did," says Khan.

The director turned into a squirrel fan girl watching Ulysses soar on a big screen for the first time.

"Ulysses came to life, it was so exciting," says Khan. "You could see the wind going through his fur when he flies. You could see the food debris on the whiskers and the tiny glint in his eyes."

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