A male elephant seal rests on the Piedras Blancas elephant seal rookery on the central coast of California, the United States, Dec. 8, 2019. (Photo by Joel Lerner/Xinhua)

 

Adolescent male elephant seals learn the battles that will determine dominance for mates on the Piedras Blancas elephant seal rookery on the central coast of California, the United States, Dec. 7, 2019. (Photo by Joel Lerner/Xinhua)

 

A baby elephant seal (L) rests next to its mother on the Piedras Blancas elephant seal rookery on the central coast of California, the United States, Dec. 8, 2019. (Photo by Joel Lerner/Xinhua)

Female elephant seals rest on the Piedras Blancas elephant seal rookery on the central coast of California, the United States, Dec. 8, 2019. (Photo by Joel Lerner/Xinhua)

People visit the Piedras Blancas elephant seal rookery on the central coast of California, the United States, Dec. 7, 2019. (Photo by Joel Lerner/Xinhua)