400 dead dolphins wash up on African shores

From my understanding, dolphins are smart creatures. Reading about 400 dolphins washing up dead along African shores creates many unanswered questions.
“It is quite strange for so many animals to strand,” said Douglas Nowacek, an oceanographer at Florida State University in Tallahassee, who has studied dolphin deaths. “These animals are normally quite able to cope with stressors.”
Local residents speculated that low tide combined with heavy rains and wind might have disoriented the marine mammals.
An early examination showed the animals’ stomachs were empty. They either had not eaten for a long time or had recently vomited. Further tests will look for traces of poisonous substances, such as “red tide” algae.
Is there anyone that cares to guess what they think may have happened to these dolphins? Let’s try and keep alien abduction out of the choice.
