Just encountered a 145 on Raganrock. I just ran the other way. And gave up my base to the heavenly beast. As a watched from afar on my pterodon, my base become no longer... I guess it is time to rebuild in a different base.
If one is encountered near water, you can simply lure it out to sea with a flyer and it will swiftly drown. Given the water is deep enough. If encountered inland not near water. Pray to the overseers you have something fast enough to out run it. Then promptly die because they're as fast as a mad Hispanic mother with a shoe. Not as deadly as one though.