The Río Petatlán estuary, the village walls, the lagoon edge — who lives here, what to expect, and what to respect.
The Río Petatlán drains inland Guerrero and empties into a shallow brackish lagoon directly behind the village, separated from the surf beach by a narrow isthmus. This page is the short version: the five animals visitors ask about most, each pointing to the full guide where it now lives — reptiles & amphibians, fish, mammals, birds — plus the one crocodile rule that applies to everyone.
Never enter the lagoon water. Never swim, wade, or stand at the lagoon's edge after dark. Never approach what looks like a floating log near the lagoon bank. Give any crocodile at least 10 metres.
Serious incidents with American crocodiles in Mexican Pacific estuaries are documented (IUCN Crocodile Specialist Group regional reports). Encounters here are not frequent, but the consequence of one is severe and entirely avoidable. The ocean side is yours; the lagoon side is theirs.
One line each. Photos, records, and seasonality live on the dedicated guides.
Salt-tolerant and almost entirely nocturnal near settlements, regularly 3–4 m in coastal populations and most often seen at dawn and dusk; nests March–May, and the reason the lagoon edge is a hard boundary.
Draped over the stone walls and up in the coconut palms and mango trees along the beach road, basking until midday; males turn orange-rust November–March. Harmless — but do not hand-feed.
Stone walls and rocky foundations at the north end of the beach — quicker to bolt than the green iguana, but back within minutes if you stay still; nests March–June, when females cross open ground.
Ambush predator of the mangrove roots and channel edges, fished on tidal movement with live bait or slow soft plastics; the wet season (June–October) is the window, and larger fish are increasingly released.
Works the beach breaks and rocky points in a few feet of water and can be sight-fished from the beach on calm mornings; strictly catch-and-release, with larger fish May–October.