Just found my first giga which was level 83 in artic ,i ran back to my base to get tons of narcs and went back and the giga was still there,i hit him with my ptera which was named Swift Tail.She was level 146 when i tamed her and now she is level 174..I went on top of a mountain and hit the giga with an arrow to aggro it and then he got stuck in between rocks and i hit him with green arrows for about 9 times and he ran back and he saw a moose(mega something).He started attacking it and i thought it was my chance but i felt off my mountain and my ptera was on stop mode.So i made her in follow mode so that i can escape but what u know,that moose was blown away in one hit and i was blown away in 2 hit(im level 56) and then my ptera got blown away in a few hit cause he was passive mode,yes it was my fault my baby died.

R.I.P Swift Tail