Anchorage Daily News: Marine mammal biologist Craig Matkin of Homer has tracked the animals since the mid-1980s and said he never thought he’d see an entire population of whales — even a small one — disappear. “To blame it all on the spill would not be fair, but that’s the final death blow,” Matkin said. The plight of this group of killer whales contrasts with the full or slow, partial recovery of many other animal populations, including another group of whales, since the 1989 oil …