The roughly 800 dolphin deaths observed off central and northern Peru are likely a result of natural causes, Fox New Latino website said on Wednesday, citing a government agency finding.
Meanwhile, deaths of more than 1,200 pelicans were blamed on starvation, owing to warming-induced migration of the cold-water fish that are the birds' food.
According to Peru's Sea Institute, human activities have been "ruled out as a direct cause of death" for the dolphins. However, the report left the exact cause of death undetermined.
As for the pelican deaths, these were attributed to lack of food, a government minister stated told a Peru radio audience on Tuesday.
Migration of cold-water fish away from the coast has followed warming of the sea surface off central and northern Peru. Most of the dead birds were found to be "very young pelicans", inexperienced in gathering their own food.
The hundreds of dead seabirds were found along a stretch of beaches in Piura and Lambayeque regions earlier this year, leading to calls for an official investigation.
Some cooler weather is in store for Chicago this week as thunderstorms roll into the area around late week.
A dangerous multiple-day severe weather outbreak will begin this weekend over the South Central states and will include the potential for nighttime tornadoes in parts of Texas and Kansas.
A large storm will form over the eastern half of the nation next week and will bring a swath of unsettled conditions for days.
Stormy weather will continue in the Dallas area through Thursday morning, but conditions will improve on Friday.
A slow-moving low pressure system will make residents of the Northwest reach for their raincoats and umbrellas each day through the remainder of the week.
Surviving a flight in the wheel well of a commercial aircraft is possible, but highly unlikely due to subzero temperatures and thinner air than what is found at the peak of Mount Everest.
Helena, MT (1960)
19.4" of snow; up to 30" in higher elevations.
Bismarck, ND (1962)
91 degrees -- heat wave in the Plains.
Mathis, TX (1990)
A stationary thunderstorm dumped about 8" of rain in two hours at a grain elevator just west of town.