Coastal Research and Education Society of Long Island
Coastal Research and Education Society of Long Island
Coastal Research and Education Society of Long Island
Coastal Research and Education Society of Long Island
Coastal Research and Education Society of Long Island
Coastal Research and Education Society of Long Island

Coastal Research & Education Society of Long Island, Inc.

Our mission is to promote and foster understanding and stewardship of coastal ecosystems through research and education


The Coastal Research and Education Society of Long Island,  was founded in the summer of 1996 by a group of experts in marine mammal science, environmental sciences, education and conservation. CRESLI was formed for the purposes of conducting research, providing educational experiences and promoting conservation of coastal ecosystems.  Research and education are inextricably linked in all CRESLI activities. As such, CRESLI actively seeks cooperative alliances with researchers, educational institutions, and the participation of the public. Our pinniped and cetacean research projects, for example, utilize public whale watch cruises and seal walks as platforms for collecting data and educating the public at the same time.

We are committed to our mission and have been since 1996. Join us on any of our excursions, lectures, activities to learn about our coastal waters and the ecosystems therein. Come out on trips top see the amazing diversity of marine mammals, sea turtles, pelagic birds, and other marine life. Become a member and/or a volunteer and join us in our work.


Autumn, Winter, and Spring are our SEAL WATCHING/RESEARCH seasons.

28,118 seal encounters at Cupsogue Beach since 2006 (464 trips). Join us at Cupsogue Beach for our 17th year, to observe, photograph, and learn about Long Island's seals.

The walks suitable for children and are approximately 1.2 miles round trip and take about 1 to 1.5 hours.

For more information and the dates and times for all 36 upcoming seal walks


Here's a slideshow of the best of our 2021 Seal Walk season


Summer is our WHALE WATCHING/RESEARCH Season.

Travel with us from Montauk to near and offshore waters in search of whales, dolphins, porpoises, sea turtles, pelagic birds, and more.

Join the crew with over 30 years of whale watching experience. Come away with great memories, great photos and videos, and an education about whales, dolphins, sea turtles, and marine life that is second-to-none.

Latest whale watch information.

Here's a slideshow of the best of our 2021 Whale Watch season


CRESLI is a non-profit organization as defined in section 501 (c) (3) of the Internal Revenue Code. All Contributions are deductible to the fullest extent of the law. A copy of the last financial report filed with the Department of State may be obtained by writing to NYS Dept. of State, Office of Charities Registration, Albany, NY 12231.

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CRESLI 2021-2022 Seal Walks and Research at Cupsogue Beach

CRESLI 2021-2022 Seal Walks and Research at Cupsogue Beach

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