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To tame a Shastasaurus, lure it to the ocean surface using 1-3 tamed Ichthyosaurus as bait. Once surfaced, dive underneath and use a Sickle to scrape three leeches off its belly. After clearing the leeches, feed it Extraordinary Kibble (or Raw Prime Fish Meat) at its mouth. Repeat the leech-removal and feeding cycle until taming completes. More Ichthyosaurus nearby extends the time it stays surfaced.
Creatures like the Shastasaurus don't tame by the usual rules. Thanks to Dododex for inspiring how we work out these special tames.
