This is a fiction story but it does make you think. Some people really write well..
Once again, the "experts" in their field have failed. Dr. Jane Hogarth at the Wellington Zoo was raising a young wallaby Lulu whose parents were killed by poachers and a baby platypus Oscar who lost one foot in a trap. Raised together, they refused to interact with their own species when separated and showed signs of extreme stress calling out to each other. Dr. Jane wrote her superior who said she was interfering with the natural order of things and to keep them separated.
They refused to eat and she put them back together and wrote the other Dr. again for advice. Again he told her to separate them, they would not starve. After a month of IV feeding because they both refused to eat, she put them back together and they immediately ate well. She was fired, the animals were separated and starved themselves to death.
So, if babies are raised together, even if one is a wallaby and one is a platypus and when separated they won't eat, the "experts" chose to let them starve. One Dr stood up for them and was terminated. It is a short read, the letters between her and her boss, but here is a link...
http://masticatinginpublic.blogspot.com/2009/09/natural-order-short-story-by-sevastian.html