I'll have alook and see if I've got any spare, desertgirl, although I'm not sure I'll be able to gift twice in one day - the main thing is you need to build up money, and then buy more animals. the more you buy, the more become available, and the insects 9and I think the butterfly counts for this) will come along eventually.
This is quite a slow burner game, in some ways, as the higher up the levels you get, the more time it takes to complete. level 27, where I am, you have to get $4 million dollars, and for later levels you have to get up to $25million.
And eventually you will need 100 different species, etc.
I'm currently torn between buying mor animlas to count towards my 100 species (at $300,000+ each) or saving to get the $4 million... dilemma!