Bird knees are in the same direction as all other knees, the articulation you are thinking about is the ankle https://en.m.wikipedia.org/wiki/Bird_feet_and_leg

Bird knees are in the same direction as all other knees, the articulation you are thinking about is the ankle https://en.m.wikipedia.org/wiki/Bird_feet_and_legs https://en.m.wikipedia.org/wiki/Bird_feet_and_legs In a lot of mammals too the knee is "hidden" https://duckduckgo.com/?q=horse+hind+legs+anatomy&t=fpas&iax=images&ia=images&iai=https%3A%2F%2Fhorsesidevetguide.com%2Fwp-content%2Fuploads%2F2014%2F11%2FFINAL-QR-Hind-Limb.jpg https://duckduckgo.com/?q=horse+hind+legs+anatomy&t=fpas&iax...