Sunless Skies - Sovereign Edition [EP 76] - That Lady, Has a Octopus, In Her Hat. 

@LtColShingSides I'm not to sure, I feel there might be a 'good' hatch, ill keep trying to find out xD

there is a chance, it hatches some special animal, which starts a quest :) and could lead to new mascot. but it is quite rare. its one of 2 achievements i am still missing. chance of hatching is a bit better, when you got 3 or more eggs at same time.