Jessica Chastain is attached to star in an adaptation of Diane Ackerman's WW2-set 2007 novel "The Zookeeper’s Wife" for Panorama.
The true story account follows keepers of the Warsaw Zoo, who helped save hundreds after the Nazi army overran Warsaw.
Jan and Antonina Zabinski began smuggling Jews into empty cages, along with taking about a dozen Jews into their home.
A mix of humans and surviving animals came together in a one-of-a-kind community that included socializing and a piano concert.
Niki Caro has come aboard to direct the project, while Angela Workman wrote the screenplay. Jeff Abberley, Mike Tollin, Kim Zubick, Diane Miller-Levin and Robbie Rowe-Tollin are producing.