Clutch Size: The number of offspring produced at one birth by an oviparous or ovoviviparous animal.Nesting Behavior: Animal behavior associated with the nest; includes construction, effects of size and material; behavior of the adult during the nesting period and the effect of the nest on the behavior of the young.Oviposition: The process of laying or shedding fully developed eggs (OVA) from the female body. The term is usually used for certain INSECTS or FISHES with an organ called ovipositor where eggs are stored or deposited before expulsion from the body.Reproduction: The total process by which organisms produce offspring. (Stedman, 25th ed)Songbirds: PASSERIFORMES of the suborder, Oscines, in which the flexor tendons of the toes are separate, and the lower syrinx has 4 to 9 pairs of tensor muscles inserted at both ends of the tracheal half rings. They include many commonly recognized birds such as CROWS; FINCHES; robins; SPARROWS; and SWALLOWS.Passeriformes: A widely distributed order of perching BIRDS, including more than half of all bird species.Charadriiformes: An order of BIRDS including over 300 species that primarily inhabit coastal waters, beaches, and marshes. They are comprised of shorebirds, gulls, and terns.Pair Bond: In animals, the social relationship established between a male and female for reproduction. It may include raising of young.Sexual Behavior, Animal: Sexual activities of animals.LizardsPaternal Behavior: The behavior patterns associated with or characteristic of a father.Ovum: A mature haploid female germ cell extruded from the OVARY at OVULATION.Colubridae: The largest family of snakes, comprising five subfamilies: Colubrinae, Natricinae, Homalopsinae, Lycodontinae, and Xenodontinae. They show a great diversity of eating habits, some eating almost anything, others having a specialized diet. They can be oviparous, ovoviviparous, or viviparous. The majority of North American snakes are colubrines. Among the colubrids are king snakes, water moccasins, water snakes, and garter snakes. Some genera are poisonous. (Goin, Goin, and Zug, Introduction to Herpetology, 3d ed, pp321-29)Birds: Warm-blooded VERTEBRATES possessing FEATHERS and belonging to the class Aves.Body Size: The physical measurements of a body.Egg Yolk: Cytoplasm stored in an egg that contains nutritional reserves for the developing embryo. It is rich in polysaccharides, lipids, and proteins.Litter Size: The number of offspring produced at one birth by a viviparous animal.Wasps: Any of numerous winged hymenopterous insects of social as well as solitary habits and having formidable stings.Sex Ratio: The number of males per 100 females.Parasitic Diseases: Infections or infestations with parasitic organisms. They are often contracted through contact with an intermediate vector, but may occur as the result of direct exposure.Breeding: The production of offspring by selective mating or HYBRIDIZATION, GENETIC in animals or plants.Biological Evolution: The process of cumulative change over successive generations through which organisms acquire their distinguishing morphological and physiological characteristics.Predatory Behavior: Instinctual behavior pattern in which food is obtained by killing and consuming other species.Egg Shell: A hard or leathery calciferous exterior covering of an egg.Immunocompetence: The ability of lymphoid cells to mount a humoral or cellular immune response when challenged by antigen.South AmericaOviparity: The capability of producing eggs (OVA) from which young are hatched outside the body. While mostly referring to nonmammalian species, this does include MAMMALS of the order MONOTREMATA.Parasites: Invertebrate organisms that live on or in another organism (the host), and benefit at the expense of the other. Traditionally excluded from definition of parasites are pathogenic BACTERIA; FUNGI; VIRUSES; and PLANTS; though they may live parasitically.Maternal Behavior: The behavior patterns associated with or characteristic of a mother.ArgentinaSeasons: Divisions of the year according to some regularly recurrent phenomena usually astronomical or climatic. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)Dinosaurs: General name for two extinct orders of reptiles from the Mesozoic era: Saurischia and Ornithischia.Population Density: Number of individuals in a population relative to space.Fertility: The capacity to conceive or to induce conception. It may refer to either the male or female.Environment: The external elements and conditions which surround, influence, and affect the life and development of an organism or population.Geography: The science dealing with the earth and its life, especially the description of land, sea, and air and the distribution of plant and animal life, including humanity and human industries with reference to the mutual relations of these elements. (From Webster, 3d ed)