The penguins at the San Francisco Zoo had reason to waddle Tuesday morning when the ground beneath them began to shake.
The animals at the San Francisco Zoo got a rude awakening Tuesday morning.
The United States Geological Survey reported a 2.2-magnitude earthquake shook just a few miles offshore from San Francisco Tuesday at 12:46 a.m.
The quake was recorded about 4 miles west-northwest of the San Francisco Zoo in the Pacific Ocean, according to the USGS.
The temblor had a depth of about 5.5 miles, according to the USGS.
Bay City News contributed to this report.