Pregnant females travel to the lagoons to give birth and raise the calf. The lagoons are protected from the open ocean - currents and predators. Others may travel to warmer waters or to find mates. Scientists have found that not all whales travel to the lagoons during the winter. Some may travel a portion of the way, some may not at all.
Gray whales are benthic feeders.
That means they eat food they find at the bottom of the ocean. Gray whales are baleen whales. Baleen whales, also known as mysticetes , do not have teeth. Baleen whales have plates of baleen that hang from the upper jaw. The baleen is used to filter food from the water.