Blue whales feed almost exclusively on euphausiids (krill), with a variety of species being taken by different blue whale populations. They feed both at the surface and also at depth, following the diurnal vertical migrations of their prey to at least 100 m.
The migration patterns of blue whales are not well understood, but appear to be highly diverse. Some populations appear to be resident year-round in habitats of year-round high productivity, while others undertake long migrations to high-latitude feeding grounds (see above), but the extent of migrations and the components of the populations that undertake them are poorly known.
Loreto offers magnificent opportunities to view Great Whales. Loreto is a world-class blue whale observation destination.