The only true " monsters " in the game are humans, but there are many predators and natural hazards.

Humans and the killer whale ( orca ) are the adult gray whale's only predators.

Due to its great size and tusks, the walrus has only two natural predators: the killer whale ( orca ) and the polar bear.

Like horses, zebras sleep standing up, and only sleep when neighbors are around to warn them of predators.

However, such hybrid offspring can only survive in captivity free of predators.

These hybrids do not properly inherit survival strategies and can only survive in either a captive state or when there are no predators.

They have few predators ( besides humans ), with only scattered reports from the 19th century of wolf and bear predation.

Velvet worms are ambush predators, hunting only by night, and are able to capture animals at least their own size, although it may take almost all of their slime-secreting capacity to capture a large prey item.

Some animals, such as the kangaroo, employ jumping ( commonly called hopping in this instance ) as their primary form of locomotion, while others, such as frogs, use it only as a means to escape predators.

Leopards are the only natural predators of adult chimpanzees and gorillas, although the cat may sometimes choose to avoid these as they are potentially hazardous prey, especially large male silverback gorillas.

Many predators specialize in hunting only one species of prey.

In many cases, the predators are not only apex predators, but are also endangered species themselves as they have lower population sizes than prey species and are much more vulnerable to extinction because of their population size, competition with other predators, and the fluctuations in prey populations.

These storage sites keep tannins active against plant predators, but also keep some tannins from affecting plant metabolism while the plant tissue is alive ; it is only after cell breakdown and death that the tannins are active in metabolic effects.

The ability to produce light only requires 1 % of the organism's energy and has many purposes: It is used to search for food and attract prey, like the anglerfish ; claim territory through patrol ; communicate and find a mate ; and distract or temporarily blind predators to escape.

Considering that these trains are obviously deleterious to the survival of the individual due to the more brilliant plumes being very visible to predators and the longer plumes making escape from danger more difficult, Zahavi theorized that only the most fit males could survive the handicap of a large tail.

The only known predators of Golden Eagle nests are wolverines and brown bears.

Their powerful hind legs are not only used for bounding at high speeds and jumping great heights, but also to administer vigorous kicks to fend off potential predators.

If, as happens on rare occasions, hatching takes place during daylight, only a very small proportion of each hatch ( usually 1 %) succeed, because local opportunist predators, such as the common seagull, gorge on the new sea turtles.

In North America Bubo owls and Bald Eagles ( and possibly other eagles of comparable size ) are the only major predators of both nests and sub adults.

Male Green iguanas in these groups often use their own bodies to shield and protect females from predators and it appears to be the only species of reptile which does this.

Singing is a very costly behavior, not only because of the energy to produce sounds, but primarily for the security reasons, as all the possible predators can easily learn the whereabouts of a singing animal.

The sickle shaped caudal fin is used only to escape predators.

I'm not the only man in town with a gun, or the only one without a permit ''.

Once more he lifted Jess's gun from its holster, only this time he tossed it into the stall with the frightened buckskin.

Then, and only then, with the Jacksons and Dan as their true guests of honor, did the Harrows take time to catch up on the news.

The valley was only a few hundred yards wide with just about room enough for a properly performed hundred-and-eighty-degree turn.

Suddenly the Spanish became an English in which only one word emerged with clarity and precision, `` son of a bitch '', sometimes hyphenated by vicious jabs of a beer bottle into Johnson's quivering ribs.

And, as a matter of fact, Nicolas had slept in the park only part of one night, when he discovered that Munich's early mornings even in summer are laden with dew.

She had touched her face, truly a noble and pure face, only with a lip salve which made her lips glisten but no redder than usual.

That night he dreamed a dream violent with passion, in which he and the Woman, now the teacher, did everything except engage in the act ( and this probably only because he had never engaged in the act in reality ), and when he awoke the next morning his heart was afire.

She said, with the solicitude of a middle-aged woman for her only child.

The only drawback now to the plan he'd decided on was that someone else might fail to do his work, too, and the teacher would have that person stay late along with Jack.

In fact it has caused us to give serious thought to moving our residence south, because it is not easy for the most objective Southerner to sit calmly by when his host is telling a roomful of people that the only way to deal with Southerners who oppose integration is to send in troops and shoot the bastards down.

In 1961 the first important legislative victory of the Kennedy Administration came when the principle of national responsibility for local economic distress won out over a `` state's-responsibility '' proposal -- provision was made for payment for unemployment relief by nation-wide taxation rather than by a levy only on those states afflicted with manpower surplus.

They are huge areas which have been swept by winds for so many centuries that there is no soil left, but only deep bare ridges fifty or sixty yards apart with ravines between them thirty or forty feet deep and the only thing that moves is a scuttling layer of sand.

It lay with its head on its paws and only its eyes moving, watching us carefully.

They squatted on their heels with their heads bent far forward, their eyes only a few inches from the ground.

`` Now that Bruno Walter is virtually in retirement and my dear friend Dimitri Mitropoulos is no longer with us, I am probably the only one -- with the possible exception of Leonard Bernstein -- who has this special affinity for and champions the works of Bruckner and Mahler ''.

Indeed, it seems that only in today's Southern fiction does Tobacco Road, with all the traditional trimmings of sowbelly and cornbread and mint juleps, continue to live -- but only as a weary, overexploited phantom.

The Constitution of the Southern `` Confederation '' differed from that of the Federal Union only in two important respects: It openly, defiantly, recognized slavery -- an institution which the Southerners of 1787, even though they continued it, found so impossible to reconcile with freedom that they carefully avoided mentioning the word in the Federal Constitution.

But he plunges into yet another, this time with Norway, and is killed in an assault on the fortress of Fredrikshall, being only thirty-six years of age when he died.

The networks for military communications are one of the best examples of networks which not only must be changed with the changes in objectives but also must be changed with the addition of new machines of war.