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Remote Ready Biology Learning Activities has 50 remote-ready activities, which work for either your classroom or remote teaching.
For example, mammals have
I'm not sure what your argument is overall, but I think I agree to a certain degree. While breastfeeding is inherently mammalian (baring platypuses), it often requires overt, verbal instruction to get a human female to breast feed her infant properly. However, I would argue that "knowledge" is a pretty exclusively human concept and that there are plenty of mammal-females who are very adept at nursing without any instruction. The argument that lizards or birds will never have "knowledge" of mammary glands could also be said of a cat who will never know the joy of grasping with an opposable thumb.