It’s 11:30 on an April morning in New York City, where most residents remain in lockdown due to the COVID-19 pandemic that has swept the globe. Phyllis Tseng picks up her tote bag, puts on a face mask, and heads to work. Instead of riding the bus for 20 minutes, as she normally would, Tseng hails a cab that’ll take her directly to the Wild Bird Fund, a wildlife rehabilitation center on the Upper West Side. As an animal care manager, she tends to orphaned, injured, and sick birds rescued by New Yorkers. Much as Tseng might want to stay home, she knows that, pandemic or not, her patients need her. Just as the coronavirus has upended the wider economy, it has left many in wildlife-based careers furloughed or figuring out how to work from home. Birding guides have canceled tours, while many researchers have had to call off a field season. But Tseng is among the bird world’s essential workers. Vulnerable birds—and in some cases, entire endangered species—depend on them...