I do not want to be too negative as it is rare we see new types of contests and this must be encouraged.
First off hunting special items that give additional rewards can be a good idea. And is something that will give an additional dimention to contests. I would like to suggest care should be taken to place locations of eggs to be where needed items are to be found. Also it might be worth giving eggs (or whatever special item) an enchant value. It is also important people understand the contest and good info is given.
I do worry that stamina as a means to earn points was removed from this and previous contest. This will (and did) make reaching top tier more difficult. Stamana as a points earner should be returned. Its worth considering many had saved many refills due to the cap increase and it is likely that fewer folks would have made top tier in a normal week.
On the whole this type of contest (with a few tweaks) can add interest. So well done, but please listen to feedback.
I would also suggest that thought be given to contests where guild particupation adds to rewards.