Jonny was here buy sildenafil citrate ALLEN: On social media and in live television shots from the scene, the saga of the stranded pilot whales riveted many across the country today. But marine scientists say mass strandings by pilot whales are not that uncommon. Researchers are uncertain about the causes. External things like weather pattern, sonar or lack of food may be factors. But pilot whales are extremely social species with strong kinship bonds that scientists say play an important part in these mass strandings.