To get in the birdhouse... you need to become the caviar jump to the pot near the middle section and then to the walls now your on the walls and then walk near the birdhouse and then jump near the brown wood it has a color change and you can jump in (works with sheet of nori, the salad leaf, and any small food like the caviar) and theres a sleeping egg inside
You CAN actually go land on the Palm Tree / Coconut Tree. The only thing preventing you from landing is the leaves being non-collidable (just like the plants near Caviar and the bushes in Playground.)
easier way to get in the bird house is to go on that tree right next to the birdhouse and jump on the bricks and jump on top of the birdhouse and then try to land inside of it
Inside the bird house is a sleeping chocolate and a sleeping egg and I can't see the sleeping egg in the tree house I mean I I mean I mean the bird house