Scullys sister Melissa dies at the end of this episode. She is mistakenly shot by an assassin who was sent to shoot scully. When Melissa shows up at Scullys apartment she is shot as she looked like Scully in the dark.
Platypuses are not born - they are hatched as platypuses are monotremes, or egg-laying mammals. The platypus breeding season is spring and summer, from about September through to February, sometimes extending to March.