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The species is one of the first North American birds to lay eggs, and normally has two to three broods per breeding season, which lasts from April to July. [ 16 ] The nest is most commonly located 1.5–4.5 m (4.9–14.8 ft) above the ground in a dense bush or in a fork between two tree branches, and is built by the female alone.
Male Dendropsophus microcephalus calling. Sexual selection in amphibians involves sexual selection processes in amphibians, including frogs, salamanders and newts.Prolonged breeders, the majority of frog species, have breeding seasons at regular intervals where male-male competition occurs with males arriving at the waters edge first in large number and producing a wide range of vocalizations ...
The smallest of the red robins, the red-capped robin is 10.5–12.5 cm (4.1–4.9 in) long with a wingspan of 15–19.5 cm (5.9–7.7 in), and weighs around 7–9 g (0.25–0.31 oz). Males and females are of similar size. It has longer legs than the other robins of the genus Petroica. The male has a distinctive scarlet cap and breast.
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European Robin videos, photos & sounds on Internet Bird Collection; Sonatura: Song of the European Robin (Archived 27 August 2011 at the Wayback Machine) Ageing and sexing (PDF; 2.9 MB) by Javier Blasco-Zumeta & Gerd-Michael Heinze; Robins in slow motion #2 - UHD 4K video published by wildlife cinematographer Steve Downer via YouTube
Bonobos mating in a zoo Stags fighting while competing for females—a common sexual behavior Anatomical structures on the head and throat of a domestic turkey. 1. Caruncles 2. Snood 3. Wattle (dewlap) 4. Major caruncle 5. Beard. During sexual behavior, these structures enlarge or become brightly colored.
Tourists on a road in Yellowstone National Park spotted two male bison fighting on July 28, amid the species’ annual mating season.Footage taken by Ella Mayes shows two male bison butting heads ...
Male impalas fighting during the rut or breeding season. The rut (from the Latin rugire, meaning "to roar") is the mating season of certain mammals, which includes ruminants such as deer, sheep, camels, goats, pronghorns, bison, giraffes and antelopes, and extends to others such as skunks and elephants.