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Beginning in February, hundreds of dolphins and sea lions started washing up on California beaches, either dead or suffering neurotoxin poisoning symptoms such as aggression, lethargy and seizures.

The tiny, flattened and sluglike creatures can cause gastrointestinal problems, weight loss and lethargy when a person eats an infected fish.

It's one of dozens of sickened animals that have been spotted across California beaches recently - many suffering from symptoms like seizures or intense lethargy.

Typically, symptoms of bird flu in cats include a loss of appetite, lethargy and fever, along with neurologic signs, such as repetitively moving around in circles or “circling,” tremors, seizures or blindness.

Without exercise, the human body becomes less efficient at producing energy, which leads to lethargy.