OAKLAND (CBS/AP) — Officials are warning residents in the East Bay about rattlesnakes following two recent bites.

The East Bay Regional Park District issued an advisory about rattlesnakes after the most recent bite on Friday when a rattlesnake reportedly bit a teenage girl in a residential area of Clayton near Mount Diablo State Park.

READ MORE: Berkeley Police Arrest Suspect for Series of Anti-Semitic Hate Crimes

And, on April 23 in Mount Tamalpais State Park, a rattlesnake bit a 79-year-old man twice. He had to be airlifted to the hospital.

READ MORE: Stimulus Check Update: Is A Fourth Relief Payment Coming?

Both he and the girl survived the bites.

The park district’s advisory warns residents that the snakes like to explore when the weather gets warm. They say hikers should never go alone, always pay close attention to the ground and keep themselves and their pets on designated trails.

MORE NEWS: UPDATE: Lighter Winds Lead To Early End of Red Flag Warning in North and East Bay Hills

© Copyright 2018 CBS Broadcasting Inc. All Rights Reserved. The Associated Press contributed to this report