Show Notes
Chris and Angie return after a National Geographic event with photographer Amy Vitale and introduce an episode on sand dollars, prompted by Angie finding live sand dollars with her family and wanting answers to her kids’ questions.
They describe sand dollars as flat, burrowing echinoderms with an internal calcium-carbonate “test,” tiny spines and cilia, petaloid patterns with tube feet for respiration, slow movement and burrowing.
They also discuss global distribution, size variation, feeding as deposit feeders. Major threats include bottom trawling/dredging and ocean acidification; they suggest using Monterey Bay Aquarium’s Seafood Watch and highlight the National Marine Sanctuary Foundation and practical pollution-reduction steps.
Timeline
00:00 Welcome Back Nat Geo 00:55 Why Sand Dollars 05:09 What They Look Like 09:20 Sizes And Range 11:43 Why They Matter 17:16 Threats And Trawling 25:06 What You Can Do 28:18 Evolution And Classification 33:40 Movement And Lifespan 37:00 Sand Dollar Skeleton Test 38:37 Top View Flower Pores 42:11 Tube Feet Water Vascular 44:28 Missing Eyes Brain Blood 48:18 Predators And Defense 50:08 How Sand Dollars Eat 54:28 Poop And Nutrient Cycling 56:41 Behavior Chemical Cues 01:00:53 Reproduction Life Cycle 01:09:44 Conservation And Curiosity
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