You can't fool a hawk. So for her new film, Claire Foy had to learn their ways

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“H Is for Hawk” is for the birds.And such majestic creatures they are, holding their own opposite the magnificent Claire Foy (“All of Us Strangers”).The film, directed by Philippa Lowthorpe and based on Helen Macdonald’s memoir, centers on Foy’s character Helen, devastated by the sudden loss of her father (played by Brendan Gleeson).

In her grief, she turns to a childhood interest, falconry, and buys a goshawk.The wilder the bird, the tamer the name; Helen calls her Mabel.Producer Dede Gardner and Lowthorpe had worked with Foy before (in “Women Talking” and “The Crown,” respectively) and agreed she’d be perfect as Helen.

But Mabel was another story entirely.Lowthorpe tapped Lloyd and Rose Buck, married bird specialists who had worked for decades on natural history documentaries with the likes of David Attenborough.Since they were conveniently located not far from her home in Bristol, England, the three got together to figure out how to make the film work.Five birds were needed to play the character of Mabel at different points; the main two would have to be raised and trained by the couple long before filming began.

Sisters Mabel 1 and Mabel 2 had the bulk of the work.“They’re from the same clutch, but they’re like chalk and cheese in character,” says Lloyd.

“Mabel 2 is much shier and has more wildness in her,” so she was used in the nervous bird scenes early on.Mabel 1 was used to fly to and from Foy’s glove, and for much of the action depicting Helen cohabiting with Mabel in her house.Jess, on loan from a friend in Scotland with a falconry center, was accustomed to people, so she was featured in Mabel’s calmest moments.

Juha, the only male and much smaller than the females, was seen only in high aerial shots.And Lottie starred in the hunting scenes, traveling up to 45 miles an hour through the woods to capture her prey.Before filming w...