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Dear ECS experts, The attached (and several more of slightly varying sizes) were part of a bottlenose dolphin's stomach content. It seems calcacerous but not bony. Has no layering in cross section. The middle ring area has a trabeculated structure. Anyone knows what it is? Regards, Dan Dan H. Kerem Israel Marine Mammal Research & Assistance Center The Recanati Institute for Maritime Studies The University of Haifa Mt. Carmel Haifa, 31095 ISRAEL Phone +972 4 8249449 Fax +972 4 8240493