Humans feed animals all the time, whether it’s our pets, the chickens we plan to eat or the ducks at the park pond, even though we shouldn’t. Throughout history in fat years and lean across many cultures, sometimes with no apparent reason, humans have fed animals of every imaginable stripe in every imaginable way. Some researchers think the desire to give food to other animals may drive domestication as much as the human desire to eat them does.

Our Stone Age leftovers from the hunt may have fostered the domestication of dogs. Some of us give our beloved dead to vultures, which is a problem when the birds disappear. We fed and feed cats both tame and feral, sharks, alligators, deer, hedgehogs, bears, pigeons of all sorts, ducks, swans, zoo animals, lab animals, pets, farm animals and more.

Now, a group of researchers in Britain is asking: Where does this desire to give food to other animals come from, and what has it meant for animals, humans and their shared environments? One striking possible answer is extinction. Domestication may be the death knell for wild progenitors. The ancestors of horses and cattle are gone. And while there are still wolves around, they are not thriving the way dogs are.

Some feeding of animals is purely practical. You feed chickens today if you want to eat their eggs, or their wings, tomorrow. You can’t ride a starving horse. Animals used for experiments in laboratories have to be kept alive to get cancer. But a lot of feeding is unrelated to any return on investment. The black kites of Delhi reach population densities that may be the highest for raptors anywhere because of accidental and purposeful feeding. They rely on garbage and on the tasty and nutritious pests that garbage attracts. Many Indians feed street dogs as a matter of course, treating them as animal neighbours. In a small city near Ahmedabad, residents told me that you can’t just give dogs plain leftover bread. You have to put some clarified butter on it, to make it palatable. Almost nothing about humans feeding animals is fully understood, largely because scholars have not given the subject a great deal of attention. And that, most of all, is what the researchers in England and Scotland want to change. With a four-year grant of more than $2 million from the Wellcome Trust, five researchers are pursuing a collaborative multidisciplinary attempt to give animal feeding its due, and begin to answer some puzzling questions. They call their project, “From ‘Feed the Birds’ to ‘Do Not Feed the Animals.’” Naomi Sykes, an archaeologist at the University of Exeter, is the moving force behind the project. Dr. Sykes sees much of the human habit of feeding animals in the light of domestication, which she says happened as much through the process of humans feeding animals as it did through catching and corralling them to eat.

That seems clear enough with our close companions, dogs and cats. It also seems that some animals that we now eat, like chickens and rabbits, may have first come into our lives not as food, but as eaters. Bird feeding is just one example, and that sets off warning bells for her, because domestication and extinction often go together even if the cause and effect isn’t clear. As long as there are people, there will be dogs. No one knows what they will look like, and whether we will have to brush their teeth day and night, and spend a fortune on their haircuts. But they will be here. The same cannot be said of wolves. And as wild creatures go extinct, we all lose.