Are there crocodiles on Sanibel Island? Yes! Although American alligators are much more common, the rare American crocodile has a remarkable history on Sanibel. After the loss of the island's famous resident crocodile in 2010, additional crocodiles have been documented, including two photographed together in 2025.

Recent sightings, possible courtship behavior, and nesting activity have renewed interest in whether Sanibel could eventually support a successful breeding population of these threatened reptiles.

Sanibel's Famous Crocodile Wilma: A Remarkable Island Survivor

For decades, Sanibel residents and wildlife enthusiasts enjoyed sightings of an extraordinary American crocodile affectionately known as Wilma.

First documented on Sanibel in 1979, Wilma became a familiar sight around the J.N. "Ding" Darling National Wildlife Refuge, the Sanibel Slough, and nearby waterways.

In 1986, wildlife officials captured Wilma on Pine Island and relocated her approximately 70 miles south to Collier-Seminole State Park. But Wilma had other plans. Within months, she had returned north, eventually making her way back to Sanibel.

Wilma was known for building nests, including in residential areas near the wildlife refuge. Unfortunately, her eggs never successfully hatched, possibly because they were unfertilized or because temperatures were unsuitable for incubation.

In 1998, the City of Sanibel officially declared the island an American crocodile refuge and endorsed efforts to establish a breeding population.

Wilma's remarkable life ended during an extended cold spell in 2010. Her body was discovered along the Sanibel Slough by longtime SCCF wildlife educator Dee Serage-Century.

Her death marked the end of an extraordinary chapter in Sanibel's wildlife history, but it was not the end of crocodiles on the island.

American Crocodiles Return to Sanibel Island

Following Wilma's death, two female American crocodiles were relocated to Sanibel as part of the island's crocodile refuge efforts.

Over the years, crocodiles have been observed in waterways around the Dunes Golf and Tennis Club, now known as Sanibel Island Golf Club, and other suitable island habitats.

In February 2025, wildlife photographer and SCCF volunteer Gary Biltgen photographed two American crocodiles together at Sanibel Island Golf Club.

The sightings were particularly exciting because the crocodiles appeared to exhibit possible courtship behavior, including touching snouts and blowing bubbles.

Although the behavior suggested potential mating activity, wildlife officials cautioned that the photographs alone could not confirm whether a male crocodile was present.

Could Baby Crocodiles Be Born on Sanibel?

In April 2025, the Sanibel-Captiva Conservation Foundation (SCCF) reported that the Florida Fish and Wildlife Conservation Commission (FWC) was monitoring possible crocodile nesting activity on Sanibel.

A female crocodile had been observed scratching and digging in a residential backyard adjacent to SCCF's Wildlife Corridor between Casa Ybel Road and Tarpon Bay Road.

At the time, wildlife officials had not confirmed whether eggs had been deposited or whether any eggs were fertile.

According to SCCF, Sanibel had not documented a successfully hatched American crocodile nest despite its longstanding efforts to encourage a breeding population.

The nesting activity was nevertheless an encouraging development for wildlife researchers studying the northern range of the American crocodile.

Why Are Crocodiles Appearing in More Sanibel Waterways?

American crocodiles prefer coastal habitats with brackish or saltwater, unlike American alligators, which are more commonly associated with freshwater.

Hurricane Ian and subsequent storm surge events altered water conditions across Sanibel, increasing salinity in many lakes, canals, and wetlands.

SCCF Wildlife & Habitat Management Director Chris Lechowicz explained in 2025 that these changes created more crocodile-friendly habitat, allowing crocodiles to move more freely between island waterways.

Because crocodiles are highly mobile, individual animals may also arrive from or travel to other coastal areas.

These changing habitat conditions may help explain why crocodiles have been observed in locations beyond their historically familiar areas.

American Crocodiles vs. American Alligators on Sanibel

Sanibel is one of the places in South Florida where both American crocodiles and American alligators can occur naturally.

Although they may look similar, there are several important differences.

American Crocodile (Crocodylus acutus)

  • Narrower, more pointed snout

  • Generally grayish-green coloration

  • Fourth lower tooth often visible when the mouth is closed

  • Prefers coastal, brackish, and saltwater habitats

  • Much less commonly encountered on Sanibel

American Alligator (Alligator mississippiensis)

  • Broad, rounded snout

  • Generally darker gray or black coloration

  • Lower teeth usually hidden when the mouth is closed

  • Primarily inhabits freshwater lakes, ponds, canals, and wetlands

  • Common throughout Sanibel Island

Both species are important native predators that help maintain healthy aquatic ecosystems.

Are American Crocodiles Dangerous?

American crocodiles are generally wary of people, but they are large, powerful wild animals and should always be treated with caution.

The FWC recommends keeping a safe distance from crocodiles and alligators, never feeding them, keeping pets leashed near waterways, and supervising children around the water.

Crocodiles may occasionally rest with their mouths open. This behavior, called gaping, helps regulate body temperature and does not necessarily indicate aggression.

Residents and visitors should never approach a crocodile for a photograph or attempt to interfere with nesting activity.

American Crocodiles Are a Florida Conservation Success Story

The American crocodile was once severely depleted in Florida because of habitat loss and hunting.

Federally listed as endangered in 1975, the species has since recovered sufficiently for its Florida population to be reclassified as threatened.

FWC estimated in 2025 that approximately 2,000 nonhatchling American crocodiles lived in Florida.

Sanibel lies near the northern portion of the species' established South Florida range, making local sightings particularly interesting to wildlife researchers.

Protecting coastal wetlands, maintaining wildlife corridors, and allowing crocodiles to move naturally through suitable habitats are important parts of their continued conservation.

Frequently Asked Questions About Crocodiles on Sanibel Island

Are there crocodiles on Sanibel Island?

Yes. American crocodiles have been documented on Sanibel for decades. Multiple individuals have been reported in recent years, including two photographed together at Sanibel Island Golf Club in February 2025.

Where have crocodiles been seen on Sanibel?

Historical and recent sightings include the J.N. "Ding" Darling National Wildlife Refuge area, the Sanibel Slough, the Sanibel Island Golf Club, and waterways near SCCF's Wildlife Corridor. Crocodiles can move between suitable habitats.

Are there more crocodiles or alligators on Sanibel?

Alligators are considerably more common. American crocodiles are rare and are generally associated with coastal and brackish-water habitats.

Have crocodiles successfully bred on Sanibel?

As of SCCF's April 2025 report, no successful crocodile hatching had been documented on Sanibel. Possible courtship behavior and nesting activity were being investigated, but successful reproduction had not been confirmed.

Why did Sanibel's famous crocodile Wilma die?

Wilma died during an extended period of unusually cold weather in 2010. American crocodiles are sensitive to prolonged low temperatures, which help limit their northern range.

Are crocodiles protected in Florida?

Yes. The American crocodile is a federally threatened species in Florida and is protected under state and federal wildlife laws.

Sanibel's Crocodile Story Continues

What began as the story of one remarkable crocodile has evolved into a broader conservation story about habitat, wildlife movement, and the possibility of future reproduction on Sanibel.

Wilma's legacy lives on through the island's designation as a crocodile refuge and continued efforts to protect native wildlife.

The return of crocodiles, documented interactions between individuals, and potential nesting activity remind us that Sanibel's natural environment is constantly changing.

For residents and visitors, the opportunity to observe such a rare native reptile is another reminder of what makes Sanibel Island an extraordinary wildlife sanctuary.

Fun Fact: The northernmost recorded American Crocodile in recent history was first spotted on Sanibel in the early '80s. She was captured on Pine Island in 1986 and relocated 70 miles south to a breeding population of American Crocodiles in the Collier County Seminole State Park. Permanently marked by the removal of the third scale on her tail, the Crocodile was found back on Pine Island and then the Ding Darling Wildlife Refuge 6 months later. Residents living in the "Conservation Corridor" became fond of their frequent crocodile sightings and enjoyed watching the female dig nests for her unfertilized eggs. It was a sad day for all when Dee Serage-Century discovered the Crocodile dead on the bank of the Sanibel River. Statements from Ding Darling Wildlife Refuge Manager Paul Tritiak, Refuge Ranger Toni Westland, and other volunteers can be found on the Ding Darling Website.

2021 Photo Credit: Bill LeJeune