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Dinosaurs And The Origin Of Birds

The peregrine falcon nests on the tundra at the same time, and this small but fierce bird of prey is able to keep off the hungry arctic fox. Red-breasted geese nest in tight knots across the nests of peregrine falcons, benefitting from the safety that the fowl of prey provides. In return, the loud alarm calls of the geese alert the peregrine, which has its personal chicks to guard. The swooping vicious attacks of the peregrine falcon quickly deter the fox from coming any nearer. The rufous naped wren builds subsequent to wasps’ nests for cover. The rufous woodpecker nests in the course of an ants’ colony. The ants’ fury soon subsides and is transferred to any intruder that tries to steal the eggs Some birds do without a nest altogether.

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Another line of evidence comes from adjustments in the digits of the dinosaurs resulting in birds. The first theropod dinosaurs had palms with small fifth and fourth digits and an extended second digit. The wrist bones underlying the primary and second digits consolidated and took on a semicircular form that allowed the hand to rotate sideways towards the forearm. This finally allowed birds’ wing joints to maneuver in a way that creates thrust for flight.

The palm swift’s nestA very uncommon cooperation in breeding has developed between members of two totally different chook species. The small red-breasted goose breeding on the Siberian tundra is extremely vulnerable to predation by arctic foxes. The geese have established a working relationship with one other inhabitant of the arctic tundra.

These are the “brood parasites,” birds which by no means construct their own nests and instead lays their eggs within the nest of another species, leaving these parents to care for its younger. By nesting near animals higher equipped to discourage predators, the birds are inadvertently protected by their neighbors.