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  2. Atavism - Wikipedia

    en.wikipedia.org/wiki/Atavism

    Atavism has also recently been induced in avian dinosaur (bird) fetuses to express dormant ancestral non-avian dinosaur (non-bird) features, including teeth. [11] Other examples of observed atavisms include: Hind limbs in cetaceans and sirenians. [3] [12] Extra toes of the modern horse. [3] [13] [14] Reappearance of limbs in limbless ...

  3. Genomic evolution of birds - Wikipedia

    en.wikipedia.org/wiki/Genomic_evolution_of_birds

    The black-chinned hummingbird (Archilochus alexandri) is the bird species known to have the smallest genome among birds, which is only 0.91 Gb long.The genomic evolution of birds has come under scrutiny since the advent of rapid DNA sequencing, as birds have the smallest genomes of the amniotes despite acquiring highly derived phenotypic traits.

  4. ZW sex-determination system - Wikipedia

    en.wikipedia.org/wiki/ZW_sex-determination_system

    The ZW sex-determination system is a chromosomal system that determines the sex of offspring in birds, some fish and crustaceans such as the giant river prawn, some insects (including butterflies and moths), the schistosome family of flatworms, and some reptiles, e.g. majority of snakes, lacertid lizards and monitors, including Komodo dragons.

  5. Sexual selection in birds - Wikipedia

    en.wikipedia.org/wiki/Sexual_selection_in_birds

    Sexual selection in birds concerns how birds have evolved a variety of mating behaviors, with the peacock tail being perhaps the most famous example of sexual selection and the Fisherian runaway. Commonly occurring sexual dimorphisms such as size and color differences are energetically costly attributes that signal competitive breeding ...

  6. Personality in animals - Wikipedia

    en.wikipedia.org/wiki/Personality_in_animals

    The study of animal personality is largely based on the observation and investigation of behavioural traits. In an ecological context, traits or ‘characters’ are attributes of an organism that are shared by members of a species. Traits can be shared by all or only a portion of individuals in a population.

  7. Cockatiel colour genetics - Wikipedia

    en.wikipedia.org/wiki/Cockatiel_colour_genetics

    This orange colouration is generally vibrant in adult males, and often quite muted in females and young cockatiels. Visual sexing is often possible with this variant of bird. [3] A normal grey cockatiel with some white or yellow feathers on the back of their head is split to the recessive mutation Pied. [2]

  8. Weka - Wikipedia

    en.wikipedia.org/wiki/Weka

    The weka, also known as the Māori hen [2] or woodhen (Gallirallus australis) is a flightless bird species of the rail family. It is endemic to New Zealand. Some authorities consider it as the only extant member of the genus Gallirallus. [3] Four subspecies are recognized but only two (northern/southern) are supported by genetic evidence. [4]

  9. Mate choice - Wikipedia

    en.wikipedia.org/wiki/Mate_choice

    Traits perceived as attractive must reliably indicate broad genetic quality in order for selection to favor them and for preference to evolve. This is an example of indirect genetic benefits received by the choosy sex, because mating with such individuals will result in high-quality offspring.