Biologists Halt Efforts to Coax 2 Whales

May 24, 2007 By MARCUS WOHLSEN, Associated Press Writer Biologists Halt Efforts to Coax 2 Whales (AP)

One of two humpback whales surfaces in the Sacramento River near Rio Vista, Calif., Tuesday, May 22, 2007. Authorities spent the day trying to herd the pair, a mother and her calf, named Delta and Dawn, downstream by banging metal pipes beneath the water.(AP Photo/Rich Pedroncelli)

(AP) -- Marine biologists temporarily halted efforts to coax two lost, injured whales back to the Pacific on Thursday morning, after recordings of clanging pipes, feeding humpbacks and killer orcas failed to induce the pair to head back to saltwater.

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