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Very nice collection For me, I will always love tripod over biped. Bipeds are often given ugly oversized feet to help them stand, or oddly splayed legs. Sometimes the figure won't stand anyway due to the legs being warped, which happens very easily. Bipeds are also not very nice from a play-perspective. A biped will not stand up on carpet even if it is very stable on a flat surface. Tripods on the other hand, will usually stand even if the legs are warped. They will stand on carpets, uneven surfaces, and non-level surfaces. Unlike a biped, they usually wont topple over at the slightest bump. My bipeds are always falling and knocking over the dinosaurs next to them. The few bipeds I own will live out most of their life laying on their sides, or leaning against a quadruped so they don't fall over and hurt themselves or others.
I have no preference for bipeds or tripods, as long as the figure is well made. They both have their merits as Seijun mentioned in the case of the tripods. The major draw of the bipeds is that they're more accurate provided they don't have over sized feet of course.Thanks for sharing your Carnegie collection. I love the old grey Apatosaurus and Allosaurus, so much nicer than the greens. The Corythosaurus for its age is still a really nice figure and one of my favorite hadrosaur toys. The Ankylosaurus is a favorite for me as well. I don't care much for the Microraptor though, never have. I know it is a popular model. The other feathered dinosaurs are fantastic though.