That's Not Where Eggs Come From! is one of the four quests you'll have to complete as part of the Eggstravaganza event in Disney Dreamlight Valley. As is the case with all event-specific duties, you're not given any hints on the events page about what this quest wants you to do - just the title and a progress checker above it. You're left to figure the rest out...
Read more.
Source: PC Gamer (opens in a new tab)