As a team, you will need to identify 2-3 questions that you could potentially answer with an experiment. You'll then develop those experiments, and ultimately conduct them.
In general, formulating a question means thinking about what comparisons you want to draw. You’ve got 4 team members, so if each person is measuring something different, what will you be comparing? Remember, you can’t compare apples to oranges. So something should be kept the same across all 4 team members.
Optimal Foraging is an enormous topic. There are myriad directions that you could take this project. Here are a few thoughts to help get you started.
Did animals besides your focal species make use of your feeding stations? If so, would it be interesting to compare foraging decisions across species?
We manipulated handling time in this experiment -- are there other ways to change handling time? Do you think they would yield similar results, or different results?
Most animals behave differently when predation risk is high. There are many ways to manipulate predation risk without actually harming any animals. Would foraging decisions change for:
feeding stations that are out in the open versus under protective cover?
feeding in the presence of a decoy predator?
feeding farther away from the nest/burrow versus closer to home?
feeding in the presence of predator sounds, i.e. hawk calls?
feeding in the presence of predator scent, i.e cat scent?
The idea of trade-offs between nutrition, time, energy, and risk can yield interesting experiments. For example, would animals tolerate more risk for a higher-reward food item than for a lower-reward one? Or would animals be willing to engage in more search/handling time for a higher-reward food?
Feeding preferences can also be interesting, and be surprisingly complicated. For example, it is interesting to know if an animal has a rigid hierarchy of preferences, with A always preferred over B, and B always preferred over C? Or can the preference depend on what else is on offer, in a "rock paper scisssor" sort of situation? I.e. A is preferred over B, and B preferred over C, but C preferred over A?
For the pilot, you used a paired experimental design, allowing you to compare how a single individual interacted with two possible foods presented simultaneously. That is one powerful to ask "Does ____ prefer A or B?" types of questions.
But experimental treatments do not need to be paired. This is especially true for treatments that cannot be simultaneously deployed. For example, if you wanted to play a hawk call, there would be no way to have a control non-hawk-call treatment set up at the same time. But you could put the treatments out separate -- i.e., to get 5 replicates of each treatment, you'd take observations at 10 different feeding stations, randomly choosing 5 for playing hawk calls and 5 for not playing the calls.