Landmark data from hummingbird bills (includes sliding semilandmarks on curves)
Berns, C.M., and Adams, D.C. 2010. Bill shape and sexual shape dimorphism between two species of temperate hummingbirds: Archilochus alexandri (black-chinned hummingbirds) and Archilochus colubris (ruby-throated hummingbirds). The Auk. 127:626-635.