Marine heat wave caused seabird deaths off California. El Nino could worsen die-off
SAN DIEGO — Within minutes of walking on a San Diego beach, marine ornithologist Tammy Russell found the feathered carcasses — one after another. Some were mixed in with washed up kelp. Others were under rocks. Each month, scientists and volunteers conduct surveys of dead seabirds and find what Russell describes as a grim assessment…