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Mute swans usually hiss at competitors or intruders trying to enter their territory. [31] The most familiar sound associated with mute swans is the vibrant throbbing of the wings in flight which is unique to the species and can be heard from a range of 1 to 2 km (0.6 to 1 mi), indicating its value as a contact sound between birds in flight. [23]
The following are two lists of animals ordered by the size of their nervous system. ... Mute swan: 323,661,000 Isotropic fractionator Pallium (DVR) Cygnus olor [34]
Migrating trumpeter swans are the largest waterfowl. The largest of the accipitrine hawks is the Eurasian goshawk (Accipiter gentilis) of temperate Eurasia. They range in size variably, but on average measure 53–64 cm (21–25 in) in length, have a wingspan of 103–117 cm (3.38–3.84 ft) and weigh 0.63–1.4 kg (1.4–3.1 lb). [54]
The average egg size (for the mute swan) is 113 × 74 mm (4 + 1 ⁄ 2 x 3 in), weighing 340 g (12 oz), in a clutch size of 4 to 7, and an incubation period of 34–45 days. [27] Swans are highly protective of their nests. They will viciously attack anything that they perceive as a threat to their chicks, including humans.
Cygnus falconeri is an extinct, very large swan known from Middle Pleistocene-aged deposits from Malta and Sicily. Its dimensions are described as exceeding those of the living mute swan by one-third, [2] which would give a bill-to-tail length of about 190–210 cm (75–83 in) (based on 145–160 cm for C. olor [3]). By comparison to the bones ...
Juvenile at the Cincinnati Zoo Its black bill is useful in distinguishing the trumpeter swan from the introduced mute swan. [13] Plate 406 of the Birds of America by John James Audubon, depicting the trumpeter swan. The trumpeter swan is the largest extant species of waterfowl, and both the heaviest and longest native bird of North America.
The ducks, geese, and swans are small- to large-sized birds with a broad and elongated general body plan. [2] Diving species vary from this in being rounder. Extant species range in size from the cotton pygmy goose, at as little as 26.5 cm (10.5 in) and 164 g (5.8 oz), to the trumpeter swan, at
Cygnus paloregonus is a fossil swan. It is an ancestor of, and distantly allied to, the mute swan. It is known from the Pleistocene from Fossil Lake, Oregon, Froman's Ferry, Idaho, and from Arizona. It is referred to by Hildegarde Howard in Delacour's The Waterfowl of the World as "probably the mute type swan". [7]