Our spring/summer project was frog life cycles:

School Projects and Discoveries
and Anything Else Power and
Zander Want to Put Here
Here's our frog just before we let him go
to live in a huge pond.
Here's his
the froglet!
And his sister who was still a tadpole when
released.  All of them were purchased
together.  We had fast, medium and slow
developers.  Mom was ready for them all to
move on at once!