简体中文Ptarmigans is sturdy members of brand new grouse relatives you to invest very of the lifetime on to the floor on or over the treeline.
Willow Ptarmigans weighing out of 450 in order to 800 http://www.hookupdate.net/ebonyflirt-com-review/ g, White-tailed Ptarmigans weigh regarding 350 g, and Material Ptarmigans was intermediate in dimensions.
The ptarmigans possess feathered legs, book among chickenlike birds, and this enhance their capability to walk in accumulated snow. There is also white wings all year long. Blow up yellow combs above the attention, being specifically apparent in the territorial and you will courting guys, was inconspicuous to barely visible in females.
Ptarmigans have three regular plumages per year, rather than the two which might be typical for many birds. This type of plumages contain the wild birds, especially the female, really camouflaged constantly. Whereas White-tailed Ptarmigans has forever white tail feathers, the brand new tails of Willow and Rock Ptarmigans are nevertheless black regarding year. Inside winter, male-and several ladies-Stone Ptarmigans sport a black colored stripe that runs through the vision towards the statement (as if they had put on charcoal masks to get rid of accumulated snow blindness), identifying her or him regarding men Willow Ptarmigans.
About three kinds exists into the The united states: new Willow Ptarmigan Lagopus lagopus, brand new Light-tailed Ptarmigan Lagopus leucurus, and the Stone Ptarmigan Lagopus mutus
Inside the ptarmigans, the new moult, otherwise losing off dated feathers, begins with your head and you may progresses toward tail. When the springtime snowmelt begins, females moult on an excellent prohibited breeding plumage of brown, gold, and you will black colored. Girls ptarmigans are hard to tell apart within the spring, nevertheless complete hues of your own Light-tailed Ptarmigan females is actually cooler in comparison to that from the new almost every other a couple of species. Breeding people reduce their moult.
The brand new Roseate Tern Sterna dougallii is a beneficial seabird one to is similar to good quick gull, nonetheless it contains the typically slender body, small ft, and you can long, indicated wings of the many terns. It is closely pertaining to the average Tern Sterna hirundo and you can the Arctic Tern Sterna paradisaeaand often is utilized in their company. Therefore, the brand new Roseate Tern isn’t very easy to identify (discover illustrations). It’s a great paler gray than Snowy and you can Prominent terns, and its own end streamers try a lot longer.
Like other grouse, ptarmigans keeps chunky authorities, short tails and you can legs, and you will quick, game wings
Brand new mature Roseate Tern are 33 to 34 cm long and it has an excellent wingspan from 72 to 80 cm. On a burden of around one hundred so you can 120 g, a grown-up is actually some smaller than good Mourning Dove. It’s a black forehead and you will nape, and its own top side is a pale grey. Their end is actually white that have deeply forked exterior feathers that provide the impression out-of a lot of time streamers if bird is within journey. The underside of your tern try light, tinged having red at the beginning of the new breeding seasons; yet not, which soft rosy tint isn’t an effective career mark, otherwise identification trait, because varies from bird so you’re able to bird, in addition to the color could be bleached out-by the sun. The fresh foot and you may legs is actually reddish, additionally the statement is generally black, no matter if expenses away from breeding birds are red-colored on the bottom. Male and female birds look-alike. Your face of the nonbreeding adult is actually mottled black-and-white.
The fresh teenager Roseate Tern possess a beneficial mottled greyish as well as rump and you can black statement and you may feet. Girls was unevenly covered with off, providing them with a beneficial spiky looks; its legs is black purplish to black.
Cues and you will audio All the terns possess a crude cry, however the Roseate Tern has actually a distinctive, two-syllable telephone call – kir-rick. This might be the best way from confirming their exposure in the a nest.