Crocodile reports are climbing in Cancún. Local officials now see six to seven sightings a month, with most calls from neighborhoods that border the mangrove. Residents point to Corales, Lombardo Toledano, and Donceles. A recent tourist bite at Nichupté Lagoon underscored the risk when people get too close. Scientists and authorities say the picture is larger than one scare: a protected wetland under pressure, seasonal breeding, heavy rains, and …