Why don't adult large hawks,eagles,and falcons have any predators?
959858
There are any number of large, terrestrial hunters that will gladly eat a hawk, falcon or eagle if given the opportunity.  Cougars, wolves, bears, leopards, jaguars, hyaenas, and even reptiles like crocodiles will eat them if they can.\n\nThe raptors avoid these predators through the power of flight.  Because of their size, it is not easy for other predatory birds to eat hawks, eagles and falcons.  They're pretty much the top of the chain.  While an eagle might be bigger than a falcon, the falcon is faster and more maneuverable.  The same factor would come into play if there was a massively huge bird that was of sufficient strength to take down an eagle.  A bird that big would be too slow, and it would be easy for the eagle to out-maneuver it.\n\nIt should be noted that large falcons (gyrfalcons, peregrine) will sometimes eat small falcons (kestrels, merlins).
424159
Ravens and all birds are considered to be messengers. As I speak there are 4 outside picking up the deer corn. Do I consider this a message. No. But last year one came and sat on the top of the gazebo and wouldn't shut up. Very annoying. About an hour later the phone rang. My daughter had just been rushed into the hospital in premature labor. What's really great about the ravens is they have a plan. About 10 or more get together and each has it's own job. One takes one road and the other ones have thier own road to monitor. When one finds food, they call to the next one, which calls to the next one and pretty soon all of them are there eating. Owls on the other hand are considered messengers of death or soon to be dead. So watch those hooters. Oh, and usually if you see an eagle, a raven is not far away. Well, where I live anyway. I just answered this ? yesterday. Now as i sit here typing, there's a Bald Eagle sitting out on the ice in front of our house. And inching closer. The only thing I can figure is, the ravens were here yesterday eating. If he's bringing a messenger... This has never happened before. Maybe I should go out there. Oh...he's walking this way!! For true.
747882
Nope, they are open water predators.
807947
Because that would require drastic changes in their species.  Prey animals which are good at running have kids who are also good at running, and the best runners survive.  If they were to start evolving into an animal which is good at fighting, it would probably be not-so-good at running.  When the first few generations were born, they would be bad enough at running to get caught, but not good enough at fighting to kill the predators.  So no baby fighters.  Animals don't change a lot in one generation.  Evolution works over thousands of generations, and the in-between ones have to be viable for it to work.
564749
I think so. At least at somepoint in their history anyway - they will have had predators, or illnesses that they could not fight, and so the fittest or more suited to survival will have survived, and the 'weaker' will have perished. It could be argued that if they are advanced then natural selection would apply less. For example humans don't really have any predators, and through medical intervention we can stop many ailments that would otherwise kill us: If a lion was born with an inherited disease which affected their mobility then they wouldn't survive for very long in the wild, and neither would a neandarthal human, but modern day humans could lead a full life with such an ailment.
1041950
They don't. Simple answer. Some might, but most don't - otherwise how would the population ever increase? If there are only ever a set number of nests then all the newborn swallows from last year will always need to find new nests... taking over nests from last year too if they come back early enough / making new ones themselves.
15655
A buzzard is a type of large bird, in any of several different but related senses:\n\nIn the Old World:\n\n    * A medium-sized wide-ranging raptor with a robust body and broad wings.\n    * A raptor of the genus Buteo. In the Old World, members of this genus are named as "buzzards", but "hawk" is more common in North America.\n    * Any raptor which happens to have the word buzzard as part of its name.\n\nIn the New World:\n\n    * A synonym for vultures, particularly the American Black Vulture and Turkey Vulture, or as a general term for vultures and condors.\n    * In parts of the United States where they are considered pest, particularly in rural areas, a derogatory term for certain birds of prey, such as the Chickenhawk (a common colloquial name referring to both the Red-tailed Hawk and the Cooper's Hawk), or the Duck hawk (known elsewhere as the Peregrine Falcon). In the US, the term "buzzard" is never used to refer to birds of prey, like hawks, eagles, falcons, and owls, outside of this context.\n    * Rarely, a derogatory term for any large bird that happens to be a scavenger, such as a raven or albatross (in other words, any large bird that is neither predatory nor flightless).\n\nOne will note that the Old World and New World uses are almost antonyms.\n----------\nVultures are scavenging birds, feeding mostly from carcasses of dead animals. Vultures are found in every continent but Antarctica and Oceania.\n\nA particular characteristic of many vultures is a bald head, devoid of feathers. This is likely because a feathered head would become spattered with blood and other fluids, and thus be difficult to keep clean.\n\nVultures fall into two groups. The Old World vultures belong to the family Accipitridae, which also includes eagles, Kites, buzzards and hawks. These are found in Africa, Asia and Europe. They find carcasses exclusively by sight.\n\nNew World vultures and condors are not at all closely related to the superficially similar Accipitridae, but belong in the family Cathartidae. They have a good sense of smell, unusual for raptors.\n\nThe similarities between the two groups are due to convergent evolution rather than a close relationship.
523944
A few years ago, I did see a crow rob a nest of a young chick. Crows will steal eggs and very young chicks for food. Crows will generally chase hawks and owls out of their territory, especially during nesting season. \n\nIt is also not uncommon to see smaller birds chasing crows, especially during nesting season since the birds know crows will eat eggs and chicks.
675372
Each has it's own methods.\nSurprisingly undergrowth and thick forest provide excellent cover. I have seen pigeons tough it out by hunkering down in a flat field, but suspect that is just the normal sleeping behaviour.\nAny creature that has it's own territory will have it's own safe places (holes, nests, caves, thick bushes, etc.), migrant species may move out of the danger area.
693341
I doubt it, if it were a baby boar and the hawk was of the largest species then it's possible I guess.  Eagles dive at mountain goats to try and make them fall off cliffs so Hwks could try that I suppose, although I don't imagine you'd find many wild boar on cliffs!
312910
few birds in the wild would survive long enough to die of old age, so it mostly depends on what the cause of death is.\n\nmany birds are eaten by various predators, others are killed when they strike immobile objects like buildings or glass doors.  a large number of them can starve to death or succumb to the elements during winter, or catch a disease (like West Nile) and die.  most of these will probably be whereever they happened to roost when they die.\n\nso there isn't one single place that birds will head for when they think they're going to die.  it takes most of them by surprise.
142064
Predatory animals...  Birds, and Owls that might eat them.\n\nAvailability of mate.... Without a mate there would be no reason to be in the area/ they wouldn't be producing a population to sustain life in that area.
206614
some animals were them on the outsied insects and lobsters.\ninvertabreas dont have a spine and some dont have any bones!
424002
It all depends on what environment they live in. There are nocturnal (night) animals that see very well at nightime. Birds of prey (eagles, hawks, falcons) have great eyesight for when they are high in the sky. Octopi have great eyes for being underwater. SO, it all depends on where they are.
938444
Well all hawks are raptors or birds of prey and all are carnivorous.  Like other raptors they are adapted to a predatory lifestyle.  They have hooked beaks for tearing flesh and strong feet armed with sharp talons to catch and kill their prey.  They feed on a variety of animals.  From insects to medium-sized mammals such as hares, rabbits,and even young foxes.  And some like the red-tailed will also feed on carrion.
108980
Their size and the size of the heard is their protection. Other than man they have no real natural predators. Although larger predators will try to pick off a stray calf they are not willing to take on a mother bison protecting her calf.
908761
That is not an exactly true statement. One of the most powerful animals for its size is the ant. Some birds and firs are much more ferocious then the big carnivores. Often people say their favorites are the big carnivores because of their perceptions of themselves and how they see others.