Dr. Jack Lawson, a marine mammal research scientist with the marine section of Fisheries and Oceans Canada points to causes of dolphin strandings:
1. Dolphins are very social. If a sick animal strands itself, then other dolphins in the pod follow along.
2. If they hear the call of their buddies near the beach, then they swim to the beach.
3. Dolphins can strand due to falling tides while chasing capelin or other food sources.
4. There are no anthropogenic causes to the strandings.
Source:
The Western Star Newspaper July 26 and August 11, 2014
http://www.thewesternstar.com/News/Local/2014-07-26/article-3813779/Expert-offers-thoughts-on-dolphin-strandings/1