Showing posts with label nest. Show all posts
Showing posts with label nest. Show all posts

Australia's Bird the Emu

Early European settlers were amazed by the emu.  Governor Lachlan Macquarie was so impressed that, in 1822, he sent two emus as gifts to the Governor-General of India, the Marquis of Hastings.  When Macquarie set sail from Australia back to England on the ship Surry, he wrote that voyaging with the passengers were "pets" that included six emus, travelling in roomy well aired pens  well-aired pens. The animals were to be given as gifts to friends and patrons of Governor Macquarie back in England. Unfortunately many of the pets, including one of the largest emus died on the trip.
Emu with young chicks
In l791 John Harris, who arrived in the new colony as a surgeon, wrote that emus were swifter than the fleetest of greyhounds. Emu eggs were described as dark Green with little black specks the of pins.  It is a little larger than goose eggs.  The emu is Australia’s largest bird standing up to 2 metres high. lt has wings but it can°t fly. lt can run really quickly around 50 kilometres per hour. The legs are also yery powerful and used for fighting, especially if males are fighting over females. Emus are common throughout mainland Australia but not in dense rainforest and urbanised areas. They are highly nomadic, which means they must move as they need in search of food, water and shelter.

An emu°s courtship is a boisterous affair. There ISs lots of bobbing up and down, weaying and dipping, throat drumming, grunting and fluffing of feathers.  Mating begins late in December: The female flattens a platform of grass into a large nest and lays her clutch of between 7 and 11 dark green eggs lthough it could be as high as 20.  lf it is a good season and there is plenty of rain she might lay one or two more clutches with different males.

After laying her eggs she leaves. The male has the sole responsibility for parenting.  When the eggs are laid, the male gets broody and begins incubation before the clutch is completed. The female stops mating with the male but might continue to lay eggs in the nest. which are fertilised by other males. It takes 56 days of incubation before the eggs hatch and striped chicks appear, usually in early spring. During this time the male emu sits on the eggs. rarely leaying the nest and only standing to turn the eggs every few hours.  He doesn't eat or drink. Drawing on fat reserves, he looses about eight kilograms.
Biology by Ty Buchanan
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emu australian bird

The Chestnut-Crowned Babbler Bird Uses Sentences

It seems that bird calls evolve like human language. Research on the chestnut-crowned babbler shows the cooperative bird is able to change the order of sounds to make new "sentences" with different meanings. The babbler does not sing like other birds. It makes a series of unique sounds.
The chestnut-crowned babbler bird uses sentences
Analysis shows that the bird is communicating in different ways by stringing sounds together. It has two main categories of calls A and B. If flying, only AB calls are made. In the nest with young birds BAB calls predominate.

When different calls were played back, AB calls initiated flight in the birds that heard it and BAB sounds caused them to go the nest. These "sentences" were definitely perceived as unique instructions. Even when sound prompt elements were changed for the sentences the birds could still tell the difference.

This is the first time a vocabulary type structure in communication has been observe in any animal other than human. The first sound in The A and B structure determines what the overall meaning is, This is similar to human words, for example like the C in CAT (when AT can be used multiple times in any human sentence). It would be pertinent to assume that language in humans began with a very simple system as in these birds.
 
 Economics by Ty Buchanan 
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Magic of the Bowerbird

The bower bird is seen as a very common bird in Australia. However, in many ways it is special, particularly the satin bowerbird. The males of this species has dazzlingly bright blue eyes. This contrasts with the dark black body which has a sheen.
Male bowerbird with female at bower
They are very intelligent and have a complex courting ritual. The color blue controls their life. The male builds an archway comprising two pillars out of twigs, fruit, feathers and flora on the ground. It is decorated by sticking bright objects onto it with saliva, even things made by humans.

When a female is within range the male struts his stuff, offering her all sorts of pretty trinkets that he has gathered. He makes chattering and hissing sounds while she examines his "things". If she likes what he displays mating will take place in the bower.

The male is so obsessed with bower making that the female has to build the nest on her own. After laying precisely three eggs she will raise the young alone.
Biology by Ty Buchanan
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Bright Plumage in Male Birds to Attract Females is Proven

Some scientists are playing with the truth about colorful plumage in male birds. They are claiming that bright colors as well as dull colors in females are to assist in blending into the environment. This is rot. Bright colors always stand out from any background.
Bright plumage male and female birds
Because just under half of bird species have females with brighter plumage than males, this supposedly proves their case. Have they considered that females need to be attractive to males as well? They predict that bright plumage will be lost in evolution. It hasn't lost been so far and there is no support for this claim.

Female humans are different than males and it should stay this way. There is no evolutionary pressure for it not to continue. Birds are no different. The premise "that both natural selection and sexual selection were (are) influential to bird coloration" is not substantiated in their research. This is just an opinion. There is no proof. Indeed, evidence for this view is virtually nonexistent.
Evolution by Ty Buchanan
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