I just finished taming one and apparently the impregnated Dino’s health drops 1-2 points every second so my trike went from 800 or so health to 1 hp when the timer was over make sure that your Dino has a bunch of health when they are impregnated and make sure to heal them using med brews or a snow owl.

Best way to counter them. Tame a high level procoptodon. Only level health and stamina. Take it to an obelisk, then access the obeliskand pick to save the procoptodon and then go scorched earth and jump into a wyvern trench and get the egg.In the island tame a bronto, then transfer the bronto , take it to the trench, lure the wyverns to a turret box use the bronto for cover. Use the wyvern against rhynios

TIP and stuff to be considered

It can grab a reaper queen and spinos

You need resin to grab structures and if you run out of resin while holding the structure it will destroy it so be careful.

For some reason in rockwells innards if you got hit by the tentacles that make you fall to the ground it has a huge fall damage even if it falls from a 2 m height

I almost 3 rhyniognatha testing stuff

Found on the island and Lost island ,in swamp just above tree line near Green ob , kill males or low levels for fearmone feed to your tame (it will die when baby hatches ) find female to lay egg on tame attack female till 10 % life left , let her attack tame to lay eggs she will fly away , tame gets cravings when eggs are on it DO NOT CRYO the tame it will KILL the eggs