An interesting article and paper was published today - Mysterious Deaths Threaten a Population of Southern Right Whales - The "mass mortality" of hundreds of southern right whale calves mystify scientists
Hundreds of the Peninsula Valdés whales have died since monitoring of their population size began in 1971, researchers report in a study published this month in the journal Marine Ecology Progress Series. From 1971 to 2011, 630 of the right whales died—adults and young ones combined.
Have a look at videos produced features Vicky Rowntree and the team in Argentina. She has suggested and discussed at an April 2013 that one of the causes about be due to harassment by kelp gulls (Larus domincanus).
Watch the documentary film - Southern Right Whales of Argentina.