The animals he caught were his family's primary food source.
The primary food source for the Canada lynx is the snowshoe hare.
Copepods and other zooplankton are a primary food source for cod in its larval stage.
There, young snakes faced a shortage of juvenile lizards, their primary food source.
When they migrate in December, they're looking for a quiet place where they can find fish, their primary food source.
While the cereals and sugarcane are a primary food source, bamboos provide a remarkable range of useful products.
The birds are thought to have starved because their primary food source, the anchoveta, has been in short supply.
As tribes became more reliant on equestrian hunting, they adjusted their annual round to match that of their primary food source, the buffalo.
Terrestrial life in Permian times was closely keyed to the evolution of terrestrial plants, which were the primary food source for land animals.
Acorns are a primary food source for a number of species including jays, pigeons, deer and squirrels, with some of the species helping disperse the seeds, but synchronised flowering enables oak trees to spread their genes through wind-dispersed pollen.
The retreat of sea ice, the report says, "is very likely to have devastating consequences for polar bears, ice-living seals and local people for whom these animals are a primary food source".
