Scout for a nest with the egg you want, and build up a short auto turret tower in that area just outside the trench. Then with a fast flyer, you can just lure out any wyverns around the best up and into a hailstorm of bullets. Makes grabbing eggs way easier (tho a bit more expensive?). I usually put up two auto turret towers just to be safe. Quick reminder that they’re gonna need to be powered by an electrical generator, windmill, etc.