A marine heat wave caused seabird deaths off California. El Nino could worsen the die-off

A marine heat wave caused seabird deaths off California. El Nino could worsen the die-off
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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 describ...