By Samantha Young
A pair of wayward humpback whales continued their improbable odyssey, swimming to the outskirts of the California capital, Sacramento.
The whales eluded marine biologists and law enforcement patrols who had searched for them throughout the day but were spotted on Tuesday evening by a helicopter pilot for KCRA-TV in the deep water shipping channel south of Sacramento.
Footage showed the whales - believed to be a mother and her calf - plying the canal about three kilometres south of the Port of Sacramento.
They were headed upriver toward the turning basin used for deep-water ships, a journey of more than 80 kilometres from the point where the Sacramento and San Joaquin rivers merge at Suisun Bay.
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"We have seen the whales; they're back," said Jim Milbury, a spokesperson with the National Marine Fisheries Service.
He said a team of experts was planning to arrive in Sacramento on Wednesday to assess the health of the whales and how they can be lured back toward the ocean.
The whales were spotted in the lower Sacramento River over the weekend and caused a sensation on Monday when they surfaced repeatedly near the delta towns of Isleton and Rio Vista.
Marine experts had expected to spend Tuesday evaluating the whales after the larger one appeared to be entangled in fishing gear. But they searched in vain until the television helicopter spotted them.
The team will determine if the object needs to be removed.
"If there is fishing line on, like there appears to be from the helicopters, it will be a question of how badly it is entangled and can it swim and survive, or not," he said.
While it's unusual for whales to reach so far into the delta, it is not the first time.
In 1985, a humpback nicknamed Humphrey was escorted back to sea after swimming in the delta for nearly a month. He returned to San Francisco Bay five years later. - Sapa-AP
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