Millions of jellyfish have invaded Puget Sound in Washington recently causing researchers to begin studying the cause.
Biologists with the National Oceanographic Atmospheric Administration and Department of Ecology have dropped nets into the sound to measure how many are underwater.
The spike in jellyfish is causing concern because they eat the same organisms as other fish, which could mean less food for those fish.
As part of the research, scientists are taking pictures of the jellyfish from the air and will compare those with data collected to determine population.
Scientists estimate approximately 2.7 million jellyfish are in Puget Sound.
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