The Hen Harrier


The Hen Harrier (Cromán na gCearc) is a spectacular bird of prey and a piece of Ireland's natural heritage that anybody interested in nature or wildlife should strive to see at least once in their lifetime. The only thing is, once you have seen a Hen Harrier, you will want to see one again and again and again!





Amazingly, the male and female Hen Harrier look strikingly different. In fact, they look so different, that for centuries people believed they were two different birds completely, and not the same species at all!






The male Hen Harrier is the flashy one. He has silver-blue upperparts but is white underneath. He has broad black tips to his wings. Typically the wingspan of adult males varies between 97 and 109cm.

The female is larger than the male and has a soft brown plumage with contrasting patterns under the wings. She has a white rump where her tail meets her body. This white rump is a sure way of knowing it is a Hen Harrier in front of you. The wingspan of adult females varies between 111 and 122 cm.

It is interesting to learn that males are brown when young. They begin to turn white when they are 1 year old onwards. One can tell young males from young females by the colour of their eyes; the young males having smoky grey eyes and the young females having deep brown eyes. When they grow older, their eyes turn amber and then yellow.

Despite their impressive wingspan, Hen Harriers are very light birds, with males weighing on average 350g and females 530g. The high wing:weight ratio enables the Hen Harrier to move effortlessly and gracefully. They are masterful among birds and can fly very fast or very slow, utilising the air as if it were an extension of their bodies. Hen Harriers can soar so high into the Spring sky that you will lose sight of them, even with high powered binoculars. At the same time, Hen Harriers typically float low over the ground in search of prey.

As well as being a spectacular and unique looking bird, the Hen Harrier displays two of the most spectacular and unique features of any species of wildlife:

The Sky Dance is the Hen Harrier's awesome courtship display. Particularly in the early stages of the breeding season, the male Hen Harrier can be seen to show off his aerial skills in a display of agility, stamina and gusto that leaves the observer dumbstruck and then inspired. The male rises high in the sky and suddenly plummets to the ground in a serious of somersaults, corkscrews and twists, stepping on the breaks just before the point of impact with the ground, continuing upwards to rise to a point where he descends again in his acrobatic display. Such displays can last for up to 20 minutes without break and are truly one of the most special sights in the entire world of nature.

The Food Pass is a means of transferring food from the male to female in mid-air! The female rises from the nest to meet the male in the sky and she turns upside-down to grasp the food which he has just dropped into her talons. She then proceeds to return to the nest and feed the young chicks. When the chicks have fledged, they too are capable of this innovative and impressive mid-air re-fuelling technique, rising to take food from either parent.

The Hen Harrier's breeding season in Ireland occurs between March and September, with the non-breeding season overlapping completely for a proportion of the population, but generally occurring between August and April. Individual Hen Harriers may occupy different sites during the breeding and non-breeding seasons. During the non-breeding season, Hen Harriers regularly form communal roosts, with multiple numbers of birds interacting with one another and settling in the one site each evening.

 
Image of a Communal Winter Roost

13 comments:

  1. Tá siad go hallain! (gabh mo leitshcéal, gach is méiriceannach mé agus tá mé ag beaganín as Gaeilge)

    Beautiful birds of prey they are!

    le meas,
    Labhrás Ó Fallamhain aka Lance Troy Fallin

    ReplyDelete
  2. Hello we have two hen harriers expected male and female for the past year on our land
    Clones Co Monghan

    ReplyDelete
  3. Hi, I was at Turlough Hill, Wicklow today and spotted what I think was a Hen Harrier hovering over the valley below. It was a good distance away but it had very distinctive black tips on its wings and a brownish body. I've never seen one before in Wicklow.

    ReplyDelete
  4. Hi, spotted a female Hen Harrier near Roslagher on coast of Clew Bay Co.Mayo today.

    ReplyDelete
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  11. Hi.

    Would it be ok for me to use one of your amazing Hen Harrier in an oil painting that I am planning. we recently saw one chasing a bird across the marshes at Mont St Michel.

    Grant

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