Blue Crane

Blue Crane

Stanley crane, Paradise crane

Kingdom
Phylum
Class
Subclass
Infraclass
Superorder
Order
Family
Genus
SPECIES
Grus paradisea
Population size
over 25,555
Life Span
20-30 yrs
WEIGHT
3.6-6.2 kg
HEIGHT
100-120 cm
WINGSPAN
180-200 cm

The Blue crane is South Africa's national bird. It is small in relation to other cranes and has a large head, a thick neck, and beautiful long wing feathers, called tertials, that trail behind it and can be mistaken for tail feathers. It has head feathers that can be erect when it is excited or being aggressive. Males and females have similar plumage but males are larger. The juvenile is a pale gray color and does not have elongated tertial feathers. Chicks have dark gray bodies and brown heads. Their feet and legs are black.

Di

Diurnal

Om

Omnivore

Wa

Wading birds

Te

Terrestrial

Co

Congregatory

Ov

Oviparous

Pr

Precocial

So

Soaring birds

Mo

Monogamy

So

Social

Fl

Flocking

Do

Dominance hierarchy

Al

Altitudinal Migrant

B

starts with

Distribution

Geography

Blue cranes are native to southern Africa, more than 99% of them living within South Africa. There is a small breeding population in and around the area of the Etosha Pan in northern Namibia. These birds breed at high elevations in dry grasslands where there is less chance of disturbance. They roost and breed in wetland areas if these are available, some individuals prefer to nest in arable land and pastureland. Blue cranes migrate locally, moving with their chicks in autumn and winter to lower elevations.

Blue Crane habitat map

Habits and Lifestyle

Blue cranes are more terrestrial than the other large cranes. Their shorter bill is an adaptation to their feeding behavior, as they feed more often in grassland areas than in wetlands. Blue cranes are territorial and solitary breeders, however, after the nesting season, the birds become highly congregatory and may gather in flocks of up to 1,000 individuals. They also prefer to roost at night communally. There is a strict hierarchy in groups, with the larger adult males being dominant. All cranes dance, with movements including bowing, jumping, running, grass or stick tossing, and the flapping of wings. They dance at any age, and although dancing is commonly associated with courting behavior, it is generally thought to be a usual part of a crane's motor development and serves to deal with aggression, relieve tension, and make the pair bond stronger.

Seasonal behavior
Bird's call

Diet and Nutrition

Blue cranes are omnivores and most of their diet is comprised of grasses and sedges, with many types fed on based on their proximity to the nests. They are also regularly feed on numerous, sizeable insects such as grasshoppers. Small animals such as crabs, snails, frogs, small lizards, and snakes may supplement the diet, with such protein-rich food often being broken down and fed to the young.

Mating Habits

MATING BEHAVIOR
REPRODUCTION SEASON
September-February
INCUBATION PERIOD
30-33 days
BABY NAME
chick
BABY CARRYING
2 eggs

Blue cranes are monogamous with long-term pair bonds. Courtship involves a dance where the male bird chases the female, interspersed with bows, leaps, and bouts of calling. From September to February is the usual nesting time, with the typical nesting site being at high elevations amongst secluded grassland. The eggs are laid on bare ground or in the grass. Two eggs are laid and incubation lasts around 30-33 days, carried out by both parents. The young are able to walk after 2 days and can swim well shortly thereafter. They are fed primarily by their mothers, who regurgitate food into their mouths. The chicks fledge at the age of 3-5 months and continue to be tended to until the next breeding season, at which time they are chased off by their parents. The young fledge from 3 to 5 months and gain reproductive maturity at 3-5 years old.

Population

Population threats

The biggest threat to these beautiful birds is habitat destruction by converting natural biomes to agricultural land. As humans continue to increase in number, agricultural expansion, persecution, disturbance, and the grazing of livestock also intensifies, and these threats will probably become worse. Other threats are colliding with power lines, predation by dogs, and illegal capture of chicks for the pet trade and for food.

Population number

According to the IUCN Red List, the total population size of the Blue crane is over 25,580 individuals, with a minimum of 25,520 individuals in South Africa. Currently, this species is classified as Vulnerable(VU) on the IUCN Red List and its numbers today are decreasing.

Fun Facts for Kids

  • Mated pairs of Blue cranes take part in unison calling, a complex and protracted series of coordinated calls. The cranes take up a specific posture, typically with heads thrown back and bills skyward during the display. Males always lift up their wings over their backs during the unison call, while females keep their wings folded at their sides. The male initiates this display and produces one call for each responding female call.
  • The Blue crane flies powerfully after running at take off, performing steady, strong beats with its wings, and alighting with dangling legs.
  • The Blue crane produces a loud, nasal 'kraaaank' as well as low-pitched, raspy sounds, rattling, and a far-carrying croak.
  • Ancient Greeks had the belief that the flight of the cranes inspired the invention of the Greek alphabet by the god Hermes.

References

1. Blue Crane Wikipedia article - https://en.wikipedia.org/wiki/Blue_crane
2. Blue Crane on The IUCN Red List site - http://www.iucnredlist.org/details/22692109/0
3. Xeno-canto bird call - https://xeno-canto.org/628105

More Fascinating Animals to Learn About