Elephant seals have been declared extinct for three times but are now back and mating.

Some 225.000 to 230.000 elephant seals head to a beach of San Mateo, California every year. The shore of San Mateo beach is the elephant seals' favorite. The marine creature began arriving mid-December last year. Most of the females were pregnant.

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Researchers used a tracking device made by Patrick Robinson, director of Año Nuevo UC Santa Cruz Natural Reserve, and his colleagues to monitor the locations of the elephant seals at sea. They discovered the kind of activities and the type of fish the seals consume through the small cameras to the elephant seals' body.

Researchers also found out there's a big difference when it comes to the male and female elephant seals. The male seals prefer staying in the Northern Pacific while females choose to stay in the Northeast.

"The elephant seals spend 90 percent of their life in the ocean. A mature male seal reaches 15 feet long and his figure is vigorous: 5.400 pounds. The females are more delicate, reaching 10 feet long and weighing only 1.500 pounds," said ranger Terry Kisser at Año Nuevo State Park.

When talking about food, it seems like it's not a big deal as adult elephant seals aren't too dangerous and capable of eating anything while on the island. The creatures' eating routine becomes normal once they go back to the sea and hunt a variety of fish 

Tags elephant seals, mating season, Russia, US, extinct, tracking device, marine mammals