I’m not sure if this has been suggested before but as a challenge reward (perhaps an added Topiary Challenge or new Alice type challenge) I would enjoy a birdhouse. Similar to our greenhouse but for nesting birds and nested eggs. We’ve all had the wrong bird nest on occasion or an egg that needs hatched that we don’t want to tear our gardens apart at an awkward time. Ie. I have a nested waxwing I need for a challenge but don’t want to hunt the roadrunners for the egg because I have a chaffinch egg already in my garden. Perhaps a new challenge showing a buildable birdhouse that displays our progress as we complete it. Any thoughts?

I'm not sure I understand your need Miss.  If you have a nested bird and need to spot roadrunners to lay the egg, then simply don't hunt for them 🤷‍♀️
I think I'd prefer a reward that was more useful to be used across the game, like all the other rewards are, than for chick eggs to be stored, which I hardly do at all (unless doing the pot lot intermediate).  But I think garden management would reduce a need for an area to store nesting birds.  I've never had any issue doing multiple nesting birds at once.

Mike said that there would be another topiary trail to give us more greenhouse space and I'd prefer that was the reward for another trail than a bird house.