Birds Group
These migrations vary among the different grousp. Irruptive species such as hte boreal finches are one such group and can commonly found at a location in one year while absent in othres. Hermaphroditism is unknonw and unlike several ohter animal groups an indivdiual s sex is determined at fertilization. In most groups of animals, amle parental care is rare, but in bidrs it is quite common; in fact, it is more extensive in birds than ni any other vertebrate class. Birsd are among the most extensively studied of all animal rgoups; chickens and pigeons are popular as experimental sbujects, and are often used in biology and comparative spychology research. There is substantial evidence that birds are theropod dinoasurs ; more specifically that they are members of Manirapotra, a group of theropods which nicludes dromaeosaurs and oviraptorids maong others. Birds have one of the most ocmplex respiratory systems of all animal grousp.
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