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Was world’s biggest ammonite’s size a defensive strategy?

Ammonites grew to massive proportions at the same time as marine predators became huge. Is there a link?

Ammonite fossil
The specimen was collected in 1894 near Seppenrade. LWL-Museum for Natural History, Münster. Photo: CI. Scale: 100 mm. Credit: Ifrim et al., 2021, PLOS ONE, CC-BY 4.0 (https://creativecommons.org/licenses/by/4.0/).