Why were birds missing from backyards during the super bloom?

Suzanne Mulcahy of Laguna Niguel became concerned when the hummingbirds in her yard disappeared around mid-April.
“I’ve always kept four feeders filled all the time,” she said. “There were birds at them continually. Then all of a sudden, my hummies (sic) were gone.”
Other bird enthusiasts had similar experiences with feathered friends disappearing from backyards when the spring season began blooming. Mary Ann Powers, owner of Wild Birds Unlimited in Riverside, said