Most animals enjoy a varied diet, with all except a few obligate herbivores or carnivores mixing a little of everything for additional nutritional value. (A few animals, such as the giant panda and the koala, are tied to one particular food.) Pigs, for example, will gladly eat meat scraps (and probably would eat meat if someone were to feed it to them). Most apes live on fruits and nutritious herbs, but add to it some insects and fresh carrion when it’s available. Your cat, nearly an obligate carnivore, nonetheless eats house plant leaves or grass, not (as most people think) in order to vomit, but because it extracts from them the folic acid which a predominantly meat diet (low in folic acid) tends to leave it short of. After extracting folic acid in its stomach from the leaves or grass blades, it then throws up the remaining plant stuff, which is indigestible to it.
First, you’ve combined two separate rodent families into one. The “Cricetidae” are mainly comprised of field mice & voles: (Peromyscus sp. (field mice) and Microtus sp. (voles).
House mice and rats are in the Muridae family: Rattus sp. (rats) and Mus sp. (house mice).
Virtually all rodents eat not only plants material but invertebrates they find while browsing. Both Cricetidae and Muridae are quite active eaters of non-plant materials and are generally included in the omnivorous category.
Then there are the Moles and Porcupines which eat much more animal matter (grubs, worms, and insects) in their diet than plant materials. Beavers are likewise omnivores, but are often mistakenly labeled as herbavores due to their wood chewing.
Members of the Muridae family have an instinctive chewing habit and if the item is palative, it is eaten, regardless of whether it is of plant or animal origin.
My mistake. Cricetidae is comprised of New World mice and rats.
Virtually all of any group will inadvertently eat insects, etc. while browsing or grazing. Others will turn to a more carnivorous diet if vegetation is scarce (e.g., muskrats)
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No, beavers are generally labelled as herbivores because of the ferns, grasses, leaves and algae that they eat. In the fall, they also tend to dine on more woody plants. See here for info on the European beaver (Castor fiber), and here for the North American beaver (Castor canadensis).
Keep in mind that terms such as “carnivore” and “herbivore” are generalizations, not absolutes. Even carnivores such as dogs and cats will occasionally eat grass or other plants. Likewise, animals whose diet mostly consists of plant matter will be termed “herbivores”, even if they do occasionally eat insects, other invertebrates, or the occasional vertebrate. As Polycarp mentioned, there are few mammals which are obligate herbivores / carnivores.
Again, terms such as “herbivore” denote a preference, not an obligation.
Feral pigs are certainly a minor predator of critters like snakes and ground-nesting birds and there is some evidence that they will also take injured deer and newly dropped fawns ( also kids and lambs ) as well.
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*Originally posted by Ms. Lois *
Virtually all rodents eat not only plants material but invertebrates they find while browsing.
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Sometimes not just invertebrates. To this day one of the most surreal sights I have ever witnessed in nature, was while walking to school one morning when I was about sixteen. As I strolled casually down the street ( being a casual guy 
), I heard this surprisingly loud crunching noise. I kept walking, trying to fix on where it was coming from. Eventually as I got closer I spotted the source, which mildly freaked me out. It was a cute-as-the-dickens Fox Squirrel sitting up on its hind legs in the gutter of the street, holding a car-flattened Robin in its front legs and enthusiatically munching on it, feathers and all. As I walked by ( including within five feet ), staring the whole while, it never paused, just kept on chewing away. I was in a odd, slightly dazed state of bemusement most of the rest of the day :D.
- Tamerlane
Uhh…Just to be clear - When I said “kids”, I meant baby goats. Not that other kind ;).
- Tamerlane
I had a friend from the boondocks who liked to jocularly exclaim, “We ain’t had so much excitement around here since the hog ate baby sister!”
Wow! Thanks for all your replies.
But, I am still wondering if Primates (other than humans) ever
catch fish and eat them?
Thanks!
Sakurako
I thought Bonobos were supposed to be closer to humans than Chimps. I never heard of Bonobos before my Human Evolution class, and I recall being somewhat awake during a video of a DNA cross-testing between the two species (us and them).
Jane Goodall says Baboons will. Also in relation to Baboons…
On the coast of South Africa, mollusks, crabs and other marine creature are regularly eaten.
From the genus Papio ( Baboon ) entry of Walker’s Mamnmals of the World, fifth edition, vol I ed. by Ronald M. Nowak ( 1991, John Hopkins University Press ).
Presumably intertidal fish would fall into the category of “other marine creatures”.
Colibri: 
ZipperJJ: To the best of my knowledge you are correct :). But in the past ( less so today ) the Bonobo was just considered a subspecies of Chimpanzee so there is a tendency to lump them together, still.
- Tamerlane
The apes include:
[list=1][li]a number of species of gibbon, Hylobates sp.[/li][li]the Siamang, the largest gibbon, Symphalagus (I don’t recall the trivial name)[/li]–these two genera constitute the Hylobatinae
[li]the gorilla, Gorilla gorilla, with at least two subspecies[/li][li]the orangutan, genus Pongo (I think the trivial name is pygmaeus[/li][li]the chimpanzees, genus Pan, including the common chimp, Pan pygmaeus and the bonobo, Pan paniscus[/li]-- these three genera constitute the Ponginae
[/list=1]
By genetics-based cladistics Homo sapiens appears to be more closely related to the two genera of Pan than they are to each other, so some modification to the taxonomy here is probably in the works.