In 1987, Leow wrote a paper, Flyovers as Day Roosts for Bats, proposing to relevant government agencies to mitigate the displacement of bat populations. He suggested that the underside of highways be “retextured” so that bats can hang on to the craggy surfaces with their claws. The idea was never adopted.
In secret, Leow worked on a few flyover tunnels himself to create more urban “caves” near forested areas, which local authorities only discovered after his death.