For the first time in recorded history, sea turtles have been discovered nesting along the West Coast of the United States. And the species responsible? The olive ridley sea turtle.
In September and November 2026, three olive ridley sea turtles came ashore in Southern California to lay their eggs, marking an extraordinary moment for marine biology and sea turtle conservation.
To better understand this historic discovery, I'm joined by Dr. Jeff Seminoff, one of the world's leading sea turtle researchers and the head of NOAA Fisheries' Marine Turtle Ecology and Assessment Program at the Southwest Fisheries Science Center in La Jolla, California.
Jeff has spent decades studying sea turtles throughout the Eastern Pacific, contributing to our understanding of their ecology, migration patterns, population dynamics, and conservation. In this conversation, we explore his remarkable journey into marine biology, including a series of expeditions across Mexico that helped shape his career and ultimately led him to become one of the leading voices in sea turtle research.
We also take a deep dive into the biology of sea turtles, exploring the different species found along the California coast, their remarkable navigational abilities, and the important role they play in maintaining healthy marine ecosystems.
Then, we turn our attention to the olive ridley sea turtles and their unprecedented nesting activity in California. Why are they showing up here? What role is the unusually warm ocean water playing? Could these nests eventually lead to an entirely new nesting population along the California coast? And what happens to the eggs once they're laid?
We also discuss one of the most extraordinary reproductive behaviors in the animal kingdom: arribada nesting, where hundreds of thousands of olive ridley sea turtles can emerge from the ocean to nest on the same beach within just a few days.
Finally, we explore the broader implications of a changing climate, including how rising temperatures are influencing sea turtle populations, the sex of developing hatchlings, and the distribution of marine species around the world.
In this episode, we discuss:
- Jeff's journey from a childhood fascination with wildlife to becoming a leading sea turtle researcher.
- His early expeditions across Mexico and the experiences that shaped his career.
- The different sea turtle species found along the Eastern Pacific and California coast.
- Why green sea turtles are considered ecosystem engineers and how they influence seagrass habitats.
- What makes olive ridley sea turtles unique, including their remarkable adaptability and reproductive strategies.
- The incredible phenomenon of arribada nesting, when hundreds of thousands of sea turtles gather to lay their eggs.
- Why three olive ridley sea turtles recently nested along the Southern California coast for the first time in recorded history.
- How El Niño and unusually warm ocean temperatures may have created the conditions for these turtles to reach California.
- The science behind relocating sea turtle eggs and the challenges of ensuring successful hatching.
- How rising global temperatures are changing the sex ratios of sea turtle populations.
- Whether California could eventually become a permanent nesting ground for olive ridley sea turtles.
About Dr. Jeff Seminoff:
Dr. Jeff Seminoff is a wildlife ecologist and marine biologist who leads NOAA Fisheries' Marine Turtle Ecology and Assessment Program at the Southwest Fisheries Science Center in La Jolla, California. His research focuses on understanding the ecology, population dynamics, and conservation of marine turtles throughout the Eastern Pacific.
Through decades of research, Jeff has helped advance our understanding of sea turtle populations and the challenges they face in an increasingly evolving ocean.
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