Taming these now can be annoying but if you have a yutyrannus use it to scare the Velonasaur and once scared chase it while shooting it with thanks, before the scare affect is gone go back to you Yuty, wait like 30 seconds then repeat the same process until it’s knocked out then starve it for a while and feed it meat, or prime meat. Worked easily for me. Hope this helped.

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