Ian’s Bird of the Week – Red-billed Tropicbird ~ by Ian Montgomery
Newsletter – 6/6/11
Last November a Red-billed Tropicbird was recorded on Lord Howe Island (http://aussiebirding.wildiaries.com/species/23736). This is the first Australian record and it is a long way from its closest breeding colonies in the Galapagos. I photographed this species in 2005 at another Ecuadorean site, Isla de la Plata (‘Silver Island’) so I thought I’d share it with you as Tropicbirds are among my favourite birds. Lord Howe Island, incidentally, has breeding Red-tailed Tropicbirds (http://www.birdway.com.au/phaethontidae/red_tailed_tropicbird/index.htm). Isla de la Plata is often called the poor man’s Galapagos as it’s a mere 40km from the Ecuadorean coast as can be visited on a day trip for about $40 and has some of the Galapagos specialties such as the Blue-footed Booby (http://www.birdway.com.au/sulidae/blue_footed_booby/index.htm).
The Red-billed Tropicbird is easily distinguished from the closely related Red-tailed by its white tail streamers and black barring on the back and wings (first photo). It is the largest of the three species with a body length of about 50cm/20in, tail streamers of at least another 50cm/20in and a wingspan of about 1metre/40in. The two tail streamer feathers are longer in the male and used in aerial display and may also be used as a rudder in flight. They are fragile, often broken (second photo) and are replaced continually.
This display may lead to a choice of nest site (from the air). Tropicbirds have webbed feet and weak legs and can move only with difficulty on land, so the choice of inaccessible cliff sites is supposed to offer protection from terrestrial predators and allow easy take off.
Ian made some interesting observations about the Tropicbirds:
- Have webbed feet
- Have weak legs
- Can move only with difficulty on land
- The choice of inaccessible cliff sites is supposed to offer protection from terrestrial predators and allow easy take off.
- When diving for prey air sacs in the head and neck absorb the impact of hitting the water.
Looks like these features add up to a neatly created design to provide for and protect the tropicbirds.
Then God said, “Let the waters abound with an abundance of living creatures, and let birds fly above the earth across the face of the firmament of the heavens. (Gen 1:20)
More of Ian’s Birds of the Week – Click Here