A Long-Suspected Culprit is Caught - Panel 7

Detailed Description
TERNS EAT KRILL AND FORAGE FISH LIKE HERRING AND SAND LANCE. USUALLY, THAT'S A NUTRITIOUS DIET. BUT WHEN HARMFUL ALGAL BLOOMS OCCUR, TOXINS CAN TAINT THE FOOD WEB FOR THE BIRDS.
Sources/Usage
Public Domain.