Sanibel packs four separate bird habitats into twelve miles, which is why it holds up as a birding destination rather than a pleasant place to see herons. On the north flank, a refuge of more than six thousand acres of mangrove, impoundment and tidal flat, where more than 245 species have been recorded. In the middle, an interior freshwater wetland — the Sanibel River and the Bailey Tract — that holds a completely different set of birds from the saltwater side. On the south shore, twelve miles of open Gulf beach where snowy plovers, Wilson's plovers, least terns and black skimmers nest. And at the eastern tip, a small wooded point at the mouth of San Carlos Bay, the first land a bird crossing the Gulf reaches.
The island's east-west axis is doing the work here as it does everywhere else on Sanibel. It sits across the mouth of Pine Island Sound, with the Caloosahatchee emptying just to the east, and it faces the open Gulf on its long southern side. That puts it at a junction of tidal flats, brackish estuary, fresh water and open coast, all within a bicycle ride.
The two facts that ruin most visits are easy to avoid. The Wildlife Drive, along with the Visitor and Education Center and the Indigo Trail, is closed every Friday of the year. And the wading birds are only close to the road for the couple of hours after high tide, when the flats are draining and the fish are trapped in shrinking pools. Turn up at the wrong state of tide and you will see water; turn up on a Friday and you will see a gate.
Beyond that, this is easy birding. The refuge road is flat and slow, the Bailey Tract is free and has no gate hours, the shared-use path lets you cycle between sites without parking, and the island is small enough that you can work three habitats before lunch. Winter is the strongest season by a distance, with January to March the peak.
One rule that applies to birders as much as anyone: taking a live shell inside the City of Sanibel has been illegal since 1995, and that includes sand dollars, sea stars and sea urchins. The same conservation ethic underpins the posted nesting areas on the beaches, which are the other thing a visiting birder needs to get right.
