The model file for sale can be scaled to any size and has the watermark removed. The free version of the file does not include these features.
The original 3D scan files come from the units and links listed below. I have used 3D software to repair the damage on each skull and optimize them for 3D printing.
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Museo [UV] Historia Natural
Grey heron
https://sketchfab.com/3d-models/grey-heron-ardea-cinerea-56d5007b0da84a1b9718597e4f7352e5
Tucan
https://sketchfab.com/3d-models/toucan-ramphastos-toco-ea9b7b6b79834efb8b8923b141bb610d
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RISD Nature Lab
Barred Owl
https://sketchfab.com/3d-models/barred-owl-skull-b45a278a318c4ffb948c2e0d4d8e4765
Spoonbill
https://sketchfab.com/3d-models/spoonbill-skull-8ea93751572f491bb23181a4b4cd9d5d
White-thighed hornbill
https://sketchfab.com/3d-models/white-thighed-hornbill-skull-3adca717270b41cb9286280ec779b067
Flamingo
https://sketchfab.com/3d-models/flamingo-skull-454c630e5fa2451cba88f7940abf8d78
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WitmerLab at Ohio University
Scarlet macaw
https://sketchfab.com/3d-models/scarlet-macaw-skull-mobile-ouvc-10633-0c327af8f828476c89cf4620ad4a4fe1