After thinking a little, the best way to get a pelican and someother missing important animals i believe something like a "zoo classic" pack would great.
Id make it a 4+1 pack, expanding on the classic set in game and featuring some more general or old school items.
For the animal selection i choose 5 animals out of the 100 most common EAZA animals, which makes sense as the oldest zoos we have are in europe + we only have suficient EAZA data.
First we got our great white pelican at spot 89, one of the last abc animals and the reason why this thread exist, then the cotton top tamarin at spot 67 as its a monkey and in fact the second most common after the common marmoset.
The third and next adc animal is the indian crested porcupine on the number 64, a community favorite and good cover animal for the pack with wide appeal.
The last habitat animal is the number 12, the benettes or red necked wallaby, the third most common australian animal after the emu and the budgie.
Lastly, the most common exhibit animal is the red eared slider, which slides right into this pack.
So there we go, each continent gets something, more classic pieces and overall only popular animals, that shouldnt be that hard to do besides the pelican.
1 for NA, 1 for SA, 1 for Oceania, 1 for Europe, 2 for Asia and 2 for Africa.
Sounds like a clear win for me as a "filler" pack between animal packs that everyone would love.