Don't put points into its movement speed if you want to glide faster. It glides as fast you run, so putting points into your movement speed will increase how fast it will glide. Hope this saves you from wasting levels like me : )
Oh archaeopteryx, you little chicken on steroids. This little guys is just a whole load of fun. They can carry you over vast distances, but also double as a, hey you seem to be falling, lemme help you out. However, getting down can be a bit of a problem. Otherwise... WOOOOOOHOOOOOOO OH YEAH IM RIDING THE SKY USING THE POWER OF A LITTLE CHICKEN THING
These creatures happen to be one of the best ways to get around, if you know how to use them. Have an ally pick you up with an Argy whilst you are holding one, have them fly up a decent height, and have them let go. You will literally be able to do laps around the map's edges without touching the ground if you know what you're doing! (Some training is required, so that you don't, say, accidentally throw it mid-air.)
Most people think this chicken is useless but you can use the archaeopteryx to fly for an unlimited amount of time! Just have an argy (or any other flying creature) on follow with a low following distance and when it is low on stamina drop from your bird and go back on it after a few seconds.... your bird is now full of stamina!