Hill's too?! And I thought I was safe with Science Diet.
Meh, Ember didn't eat the wet food yesterday anyway. She used to like it as a treat, but has gotten really picky about it lately.
Cyrus, first, you did not specify that you were NOT suggesting only tuna. You seemed to be saying that should be given in lieu of food specifically formulated for pets. Nonetheless, it remains that it is not a balanced food for them. When you start mixing foods, you risk that the careful balance of a formulated diet is thrown off by what you're giving as snacks. Even when I give treats, I only give those that are balanced nutrition (for some reason, Ember loves the hairball formulation of adult cat food above all else she is offered, so she gets that for treats, along with her teaspoon of wet food at dinner time).
Why would you think wet food is any worse than dry food in terms of formulation, though? Perhaps you need to take an animal nutrition course. The two advantages to feeding dry food over wet food are 1) the dry food is better for helping keep tartar off their teeth (keep in mind it is not a substitute for brushing your pet's teeth though), and 2) you can leave the dry food out all day so the pet can eat when they are hungry on a more natural schedule rather than having wet food put out once or twice a day, which really isn't ideal...they'll tend to overeat because they are so hungry by the time the food arrives...imagine yourself only being fed one or two meals a day on someone else's schedule with no snacks between). But, in terms of nutrient balance, it's just as good (barring this recall where they've screwed up on the protein content).
edward, corn meal is a source of protein. You'll note that on pet foods, there are multiple protein sources. This is because different sources contain different ratios of amino acids, and they are combined together to ensure all the essential amino acids are included in the formulation. Other factors that go into the formulations are digestibility of the nutrients (you want the pet to USE the nutrients, not just excrete it in larger amounts of feces), fiber content (again, a balance between proper gut motility and excessive waste production), palatability (a balance between the pet has to eat the stuff, and they have to not like it so much they just gorge themselves on it), making sure all essential amino acids and vitamins/minerals are included, and how well they achieve satiety (this helps your pet regulate food consumption...when they've had enough nutrients to maintain a healthy weight, they need to feel full, and not get hungry again too soon).
I feed some variety of foods to Ember for just such situations as this...she is used to eating primarily dry food, but should something happen that she can't be given dry food, or if she ever needs medication that needs to be snuck into wet food, wet food isn't strange to her, so she can eat that. In this case, I'll be withholding the wet food for a while, but she has dry food she likes and eats.
However, those who primarily feed wet food may be facing a dilemma right now...their pet may be refusing to eat dry food if suddenly switched, and since you may want to entirely avoid the wet food, mixing the two is not much of an option now. If you find yourself in this situation, here is a suggestion to help them make that transition. Mix boiled ground beef with cooked white rice in about a 1:1 ratio. This is not a perfect diet, so you don't want to do this for a long time, but it is very palatable and is what vets will recommend if you're having trouble getting a pet to eat and just need to sustain them until they have adjusted to a new diet or regained appetite from an illness. Mix the dry food in with the hamburger/rice mixture, gradually increasing the dry food: hamburger/rice ratio until the pet has transitioned to a dry food diet. Make sure you leave out more water than usual. If they are used to getting some of their water from wet food, they will consume more water when eating dry food.
If your pet is eating wet food because they have dental problems and cannot easily chew dry food, you can make a mash out of the dry food by soaking it in water.
I did noticed that the bird could never get a mate. Apparently there are no considerations for the handicapped in the wild. After a couple of years the little cactus wren disappeared. 
