Silver Gull

Silver Gull C. n. novaehollandiae, adult
Photo by Peter Day
Swanport Wetlands, Murray Bridge, Adelaide, South Australia, April 2016.

Chroicocephalus novaehollandiae

Larus novaehollandiae Includes Red-billed Gull

Identification

Red-billed Gull (C. n. scopulinus)
Photo by Janha
Invercargill, New Zealand, October 2004.

38-43 cm (15-17 in)

• White head, tail and underparts
• Pale grey back and wings
  • Wings black-tipped with white 'mirrors'
• Reddish, legs and eye-ring
• Reddish-orange bill
• White iris

Young Birds: lack the red eye-ring, have a black bill which turns red as they mature.

Similar species

None within its Australian range, but in New Zealand, care is needed to distinguish the rare Black-billed Gull, which shares the white iris and unmarked white head, but has a slenderer black bill, slightly less black on the primaries, and in summer, also darker legs. Within the genus Chroicocephalus, Slender-billed Gull also shares the white iris and unmarked white head, but does not occur anywhere nearby.

Distribution

Australia, New Zealand and surrounding islands.

Taxonomy

C. n. novaehollandiae, first-winter (front) & two adults.
Photo by Neil Fifer
Sydney, New South Wales, Australia, December 2004

As with other species of Chroicocephalus, Silver Gull was formerly placed in the genus Larus.

Subspecies

Three subspecies recognised, split into two species by Clements¹ and formerly by IOC², but not more recently by IOC³ nor by Dickinson⁴

• C. n. forsteri in northern Australia, New Caledonia, and the Loyalty Islands
• C. n. novaehollandiae in southern Australia and Tasmania
• C. n. scopulinus (Red-billed Gull; syn. C. scopulinus) in New Zealand, Chatham, Auckland and adjacent islands

Some authorities also recognise C. n. gunni in Tasmania, but it intergrades clinally with C. n. novaehollandiae⁵.

Habitat

Immature
Photo by Mzungu
Wellington Point, Brisbane, Queensland, September 2017

Near water, both coastal and inland wetlands. Sandy and rocky shores, parks, beaches and rubbish dumps.

Behaviour

Diet

They have a very varied diet, consisting of crustaceans, squid, insects, small fish, frogs and birds. They also scavenge from rubbish dumps.

Breeding

They nest in large colonies on offshore islands. Both adults share nest-building, incubation and feeding duties. The clutch consists of 3 eggs which are laid in a shallow nest scrape, lined with vegetation. There may be two broods raised in a year.

Vocalisation

Photo by Kay Simpson
The Spit Gold Coast, Queensland, November 2015

Call: a high pitched, raucous scrark.

References

1. Clements, J. F., T. S. Schulenberg, M. J. Iliff, D. Roberson, T. A. Fredericks, B. L. Sullivan, and C. L. Wood. 2017. The eBird/Clements checklist of birds of the world: v2017, with updates to August 2017. Downloaded from http://www.birds.cornell.edu/clementschecklist/download/
2. Gill, F and D Donsker (Eds). 2010. IOC World Bird Names (version 2.7). Available at http://www.worldbirdnames.org/.
3. Gill, F and D Donsker (Eds). 2016. IOC World Bird Names (version 6.4). Available at http://www.worldbirdnames.org/.
4. Dickinson, EC, ed. 2014. The Howard and Moore Complete Checklist of the Birds of the World. 4th ed. Princeton: Princeton Univ. Press. ISBN 978-0956861122
5. Del Hoyo, J, A Elliot, and J Sargatal, eds. 1996. Handbook of the Birds of the World. Volume 3: Hoatzin to Auks. Barcelona: Lynx Edicions. ISBN 978-8487334207
6. Handbook of the Birds of the World Alive (retrieved Sept 2017)
7. BF Member observations

• List of references

Recommended Citation

• BirdForum Opus contributors. (2024) Silver Gull. In: BirdForum, the forum for wild birds and birding. Retrieved 23 April 2024 from https://www.birdforum.net/opus/Silver_Gull

External Links

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