Ummm...? I have a few questions about this, but here's something I was able to find through some quick googling...
Jackals are omnivores and like to eat both meat and vegetation. Their diet consists of leftovers from other animals' kills, ground-dwelling birds, reptiles, antelopes, fruits, insects, berries and grass. They're not picky, though - jackals will even eat human trash, or even decomposing or diseased flesh, according to Animal Planet and LiveScience. But they generally don't attack humans.
Hyenas - at least spotted hyenas - are famously scavengers, and often dine on the leftovers of other predators. But these hardy beasts are also skilled hunters that will take down wildebeest or antelope. They also kill and eat birds, lizards, snakes, and insects.
The smaller striped hyena, common to North Africa and the Middle East as far as India, is quite capable of killing adult humans, but are not known attack people unless other food is scarce.
The spotted hyena, native to Sub-Saharan Africa, is the more dangerous of the two species, being larger, more predatory, and more aggressive than the striped hyena.
The brown hyena is only found in Namibia, Botswana, western and southern Zimbabwe, southern Mozambique and South Africa. It is currently the rarest species of hyena. It primarily survives on carcasses killed by larger predators, but sometimes eats rodents, insects, eggs, fruit and fungi too. It doesn't attack humans.
Finally, there is the small, shy and nocturnal aardwolf, native to East and Southern Africa. Its name means "earth-wolf" in Afrikaans and Dutch. It primarily eats insects, but sometimes also eggs; rarely - very rarely - it might eat small mammals or birds. Unlike other hyenas, it does not eat carrion. Like the brown hyena, the aardwolf does not prey on humans.
Sorry to go on like this, but I didn't know much about hyenas before. It's fun to learn new things.
Yeegowhen cut his palm and let the other jackals of his pack drink from him, and found that their bodies began to change too, evolving into gnolls.
If Yeegowhen was an ordinary hyena when this happens, how did he do this? Hyenas don't use tools - or have palms, for that matter. (Maybe paws)?
...during one of his attempts to work necromancy, he unwillingly created ghouls...
Do you mean that he created ghouls against his own wishes (unwillingly), or that that it was an accident (unwittingly)? Sorry, but I've been writing and editing for a long, long time.
