The Key Deer: Florida’s Tiny Island Deer That Came Back from 25

Somewhere on Big Pine Key, a deer the size of a large dog is standing in someone’s front yard eating a hibiscus flower. It weighs about 75 pounds, stands barely two feet tall at the shoulder, and belongs to a subspecies that exists nowhere else on Earth. The Key deer is the smallest white-tailed deer in North America, and by the 1950s, there were only about 25 of them left alive.

A Shipwreck Survivor’s Discovery

The earliest known written record of Key deer comes from Hernando de Escalante Fontaneda, a Spanish sailor shipwrecked in the Florida Keys in the 1550s. For centuries after, the tiny deer were hunted by Native Americans, passing sailors, and Keys settlers who considered them easy protein. By the early 20th century, poaching and habitat loss had pushed the subspecies to the edge of extinction. Florida banned hunting them in 1939, but poachers ignored the law. By 1955, the population had dropped to roughly 25 animals scattered across a handful of islands.

The Refuge That Saved Them

The National Key Deer Refuge was established in 1957 on Big Pine Key and surrounding islands, giving the deer protected habitat across pine rocklands, hardwood hammocks, and mangrove wetlands. The recovery has been slow but real. Today, fewer than 1,000 Key deer survive, concentrated mostly on Big Pine Key and No Name Key. They feed on more than 150 plant species, with red mangrove leaves, silver palm fruit, and thatch palm berries making up the bulk of their diet.

Still Fighting for Space

The biggest threat today is cars. US Route 1 cuts through the middle of Key deer habitat, and collisions kill between 125 and 150 deer each year, roughly 70 percent of annual mortality. Rising sea levels also threaten the low-lying islands they call home. You can visit the National Key Deer Refuge on Big Pine Key, where a slow drive down Key Deer Boulevard at dawn or dusk gives you the best chance of spotting one. Just don’t feed them. It’s illegal, and it’s one of the reasons they wander into traffic in the first place.