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Most measurements are from birds raised in captivity, so it is difficult to determine if major differences exist between wild and captive condors. California condors have the largest wingspan of any North American bird. They are surpassed in both body length and weight only by the trumpeter swan and the introduced mute swan.
Abnormal behavior of birds in captivity has been found to occur among both domesticated and wild birds. [1] Abnormal behavior can be defined in several ways. Statistically, 'abnormal' is when the occurrence, frequency or intensity of a behaviour varies statistically significantly , either more or less, from the normal value. [ 2 ]
Wild animals may be placed in captivity for conservation, studies, exotic pet trade, and farming. [11] Places of captivity that are connected with the AZA, (Association of Zoos and Aquariums), may hold animals’ captive as a means to save them from extinction. For example, the AZA SAFE, (Save Animals From Extinction), promotes well-being and ...
Falconry permits are issued by states in a manner that entrusts falconers to "take" (trap) and possess permitted birds and use them only for permitted activities, but does not transfer legal ownership. No legal distinction is made between native wild-trapped vs. captive-bred birds of the same species.
Captive breeding has been used to save several species from extinction, the most famous example being the California condor, a species that declined to less than thirty birds. In order to save the California condor the decision was made to take every individual left in the wild into captivity.
Adaptive differences between plant and animal populations arise due to variations in environmental pressures. In the case of captive breeding prior to reintroduction into the wild, it is possible for species to evolve to adapt to the captive environment, rather than their natural environment. [15]
A total of 289 captive-bred birds provided by the International Crane Foundation were released in the wild between 1993 and 2004. [70] Though in 2003 the population had produced the first chick conceived in the wild to reintroduced cranes, a decision was made in 2005 to release no further birds into the population until problems with high ...
Comparing the migrations of captive and wild birds using satellite telemetry, it was found that captive-bred individuals started autumn migration later and wintered closer to the breeding grounds than wild individuals. The surviving captive-bred bustards were also faithful in their wintering locations in subsequent years. As migration has a ...