Nearly two dozen penguins have been sent to California to be resettled in a cooler climate.
Authorities in Uruguay say that about 600 dead penguins have washed up on the Atlantic coast since Saturday. Experts are trying to determine what has killed the animals.
A navy statement Tuesday says the latest batch is 200 dead Magellan penguins discovered on the shore at La Paloma about 125 miles (200 kilometers) east of Montevideo.
A marine animal rescue group previously reported that the carcasses of 400 Magellan penguins washed up around the resort town of Piriapolis, along with dead turtles, dolphins and albatrosses.
The resort is about halfway between Montevideo and La Paloma.
Experts say it is common for dead penguins to appear in the area at this time of year, but the extent of the die-off appears to be unusual.
Based on reporting by The Associated Press.