Deer are herbivores, and plants make up essentially all of their diet, but the surprising truth is that deer do occasionally eat meat. Deer have been documented eating bird eggs, nestlings and fledglings, fish, carrion, and even, in a few famous cases, scavenging on human remains at forensic research sites. They also routinely gnaw on bones and shed antlers. None of this makes deer predators; it makes them opportunists. When an easy, nutrient-dense morsel presents itself, particularly one rich in the protein, calcium, and other minerals deer need for antlers, pregnancy, and milk, a deer will sometimes take it.
So the honest answer is: deer are herbivores with an asterisk. Here’s what’s behind the asterisk.
What Deer Normally Eat
Day to day, deer are browsers and foragers. The bulk of a deer’s diet is leaves, twigs, buds, forbs, grasses, fruits, nuts (acorns above all), agricultural crops, and mushrooms, shifting with the seasons. Their entire body is built for this: flat molars for grinding plant material, no upper front teeth, and a four-chambered ruminant stomach in which microbes ferment fibrous plants into usable energy.
That last detail matters for the meat question. A ruminant’s digestive system is a fermentation plant tuned for vegetation, not a carnivore’s gut. Deer can’t live on meat, can’t handle much of it, and don’t hunt in any meaningful sense. Meat, for a deer, is a supplement, not a strategy.
Deer are also notoriously flexible within their plant-based world, which is the backdrop for everything that follows. They sample constantly, adjust to whatever their region offers, and switch foods as the seasons turn, from spring greens to summer crops to fall acorns to winter twigs. An animal that opportunistic about plants shouldn’t be expected to draw a hard philosophical line at an unattended egg.
Documented Cases of Deer Eating Meat
Once trail cameras and nest cameras became widespread, evidence of occasional deer carnivory piled up faster than anyone expected. Reliably documented examples include:
- Bird eggs and nestlings. Cameras aimed at ground nests have repeatedly caught deer calmly eating eggs and chicks of ground-nesting birds. Our article on deer eating birds digs into this behavior in detail.
- Carrion. Deer have been observed feeding at carcasses, including, in one widely reported case from a forensic “body farm” research facility, gnawing on human skeletal remains.
- Fish and small animals. There are scattered reports of deer eating dead or dying fish and other small, easily captured animals.
- Bones and antlers. The most common “animal matter” deer consume isn’t flesh at all: deer routinely chew shed antlers and old bones, a well-known behavior called osteophagy.
It’s worth emphasizing how rare the flesh-eating end of this list is relative to a deer’s total intake. A deer may eat many hundreds of pounds of vegetation in a year; the odd egg or nestling is a rounding error. But the behavior is real, repeatable, and reported often enough that biologists no longer treat it as a fluke.
It’s also probably underreported rather than genuinely new. Deer eat quickly, quietly, and mostly out of human sight, and until cameras started watching nests and carcasses around the clock, an event that takes a deer thirty seconds was almost impossible to witness. Ground-nesting bird researchers were among the first to accumulate hard evidence, occasionally finding that the “predator” raiding their study nests was a doe, and every expansion of camera monitoring has added examples. The reasonable conclusion is that deer have quietly done this all along.
Why Would an Herbivore Eat Meat?
The leading explanation is nutritional opportunism. Wild plants are often poor in certain nutrients, especially the calcium and phosphorus that bucks need to grow a new set of antlers every single year and that does need during pregnancy and nursing. Eggs, chicks, bones, and antlers are concentrated packages of exactly those scarce minerals plus protein. When a deer stumbles onto one, eating it is cheap and the payoff is high.
This is also why meat-eating reports often involve the times of greatest nutritional demand, and why bone-chewing is so much more common than flesh-eating: minerals, not meat, are what the deer is really after. Seen through that lens, a doe eating a sparrow nestling and a buck gnawing a shed antler are doing the same thing, topping up nutrients their normal diet under-supplies. Similar opportunism shows up in other “strict” herbivores too, including cattle, sheep, and squirrels, so deer are in ordinary company.
Are Deer Officially Omnivores, Then?
Classification-wise, deer remain herbivores, because classifications describe what an animal’s biology is built for and what it overwhelmingly eats, not the rare exception. A deer’s teeth, gut, and behavior are those of a browsing ruminant. “Opportunistic omnivory” is the phrase biologists sometimes use for this pattern: an animal whose diet is plant-based but who won’t refuse an easy animal-based bonus. So it’s accurate to say deer are herbivores, and also accurate to say deer sometimes eat meat; the two statements simply operate at different levels.
If anything, the asterisk is a good reminder that wild animals read no textbooks. Real diets are messier than categories, and deer, adaptable around-the-clock foragers that they are, eat what their habitat offers.
For homeowners and birdwatchers, there’s one practical takeaway: if you maintain nest boxes or know of ground nests on your property, deer are a plausible, if uncommon, nest visitor along with the usual raccoons and snakes. And if you find a shed antler that looks chewed to a stub, the culprit was likely a deer or a squirrel doing exactly what this article describes, mining the woods for minerals.
Frequently Asked Questions
Would a deer ever attack an animal to eat it?
Deer don’t hunt. The animal matter deer eat is almost always immobile or nearly so: eggs, helpless nestlings, carcasses, bones. A deer has no claws, no meat-shearing teeth, and no predatory instincts; what it has is a willingness to eat a defenseless, nutrient-rich morsel it happens to walk past. Reports of deer “preying” on healthy adult animals are essentially nonexistent.
Why do deer chew on bones and antlers?
For minerals, chiefly calcium and phosphorus. Growing antlers is one of the most mineral-hungry projects in the animal kingdom, and pregnancy and milk production make similar demands on does. Old bones and shed antlers are nature’s mineral blocks, and deer (along with rodents and many other animals) recycle them by gnawing. This is why shed antlers in the woods are often found covered in tooth marks, or not found at all.
Do deer eat their own placenta?
Yes, does typically consume the afterbirth following delivery. This tidies the birth site of scent that could attract predators to a vulnerable newborn, and it recovers nutrients at a moment of high demand. It’s one more everyday example of a “strict herbivore” pragmatically eating animal tissue when it makes biological sense.
