I have finshed hatchtopia summer vibes for the most part. there are a small handful of missing hatchimals on the page that I was unable to find images for. I have also made a page for the neon nightglow egg carton which is completely done with all the images because those are easier to find. @Vanessa5242010 has created a cool page dedicated to concept art which I added a few things to.
Now for the eggciting part. I found a page on a designers website that shows the original electronic pets were once intended to go in a completely different direction. it showcases sketches of a hatchimal that was modeled more after a real bird instead of the fantasy hybrid creatures we ended up getting. it still has the titular hatching gimmick but this version also has the ability to fly similar to owleez a toy spinmaster released later on. The play has an emphasis on feeding and training your hatchimal so you can get it ready to fly. I haven't put these on the concept art page because I don't know how to convert webp files but I will put the link here if someone else knows how to do it
https://www.object8.com/hatchimals