Dozens of huge american crocodiles (Crocodylus acutus) gather in the mud under the famous bridge where the Costanera (Hwy 34) crosses the Tarcoles river west of Carara national park. Enterprising vendors have set up snack and souvenir stands where you can park (be careful of valuables left in your car) and walk out onto the bridge to see the monsters then buy a t-shirt that says “I survived the croc bridge”