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A half-ton, pregnant elephant seal had to be sedated after she caused "mayhem" by getting stuck in the middle of a busy highway for two days

Dr Sean Johnson, who is chief veterinarian at the Marine Mammal Centre in California and was the one who tranquilised the seal, told 5 live the pregnant mammal was "lucky she didn't get hit by a car".

Dr Johnson went on to say "the traffic was backed up for miles" when rescue workers were called to the seal, who was stranded on Highway 37 in Sonoma County California.

This clip is originally from 5 live Drive on Wednesday 30 December 2015.