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What may look like a milky cloudy eye here is in fact the nictitating membrane or sometimes known as the third eyelid. This membrane is transparent and will help to keep the eye moist and protect the eye from wind, dust and potential hazards. As well as birds having a nictitating membrane other animals such as reptiles and some mammals also have them.
Inspired by #Macro Mondays and a #pastels theme. Love the thin membrane from which the tiny blossoms emerge. Have wanted to grow chives for ages, but the wild critters sample and or eat everything here!
About 1.25 inches across/ 3.1 cm horizontal photo frame
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Two Mourning Doves perched on a branch in the rain yesterday. Their eye rims are a beautiful turquoise hue. This dove either used its nictitating membrane or eyelid briefly in one frame. Anyone know?
(This transparent "third eyelid" rests at the anterior edge of the eyeball and can sweep backward, cleansing and temporarily covering the eye while still allowing a view--albeit milky--of the bird's surroundings.)
Cornell has info about the dove, but I couldn't find anything about that startling (to me) turquoise and whether it is a transparent nictitating membrane (from Latin nictare, to blink) or eyelid or both: www.allaboutbirds.org/guide/Mourning_Dove
850mm
Birds of prey are fascinating and majestic animals. They can generally be defined as birds that feed on animals that they catch alive. Representatives of these two orders can be found almost everywhere in the world. Although these groups are distantly related, the behavioural and anatomical characteristics they share appear to be mainly the result of parallel evolution.
Tomball, Texas USA
One of the loudest and most colorful birds of eastern back yards and woodlots, the Blue Jay is unmistakable. This one is showing his third eyelid or nictitating membrane. Intelligent and adaptable, it may feed on almost anything, and it is quick to take advantage of bird feeders. Besides their raucous jay! jay! calls, Blue Jays make a variety of musical sounds, and they can do a remarkable imitation of the scream of a Red-shouldered Hawk. Not always conspicuous, they slip furtively through the trees when tending their own nest or going to rob the nest of another bird.
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Most birds and some reptiles have a second eyelid that is called a nictitating membrane. Translucence varies by species, but most have some ability to see through this membrane, as tracking prey and predators is a matter of survival. This membrane protects the eye and moisturizes as well. When it is opened or closed, the movement is rapid and capturing it midway is a matter of luck combined with a shutter burst. The frames on either side of this shot show it fully open and fully closed. Taken at Bombay Hook NWR on 2020 Apr 27 with a Canon R5 RF100-500mm F4.5-7.1 L IS USM + EXTENDER RF1.4x at 420 mm f10 1/1250 sec ISO 2000
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Satanic Grackle. This dude looks evil cuz I caught him with his nictitating membranes down :-)
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As everyone knows, the nictitating membrane is a transparent or translucent third eyelid present in some animals that can be drawn across the eye from the medial canthus to protect and moisten it while maintaining vision (from Wikipedia). Zoom in for a closer look.
3rd eyelid used to protect eyes on a lot of mammals and birds ,reptiles very visible on this bald eagle
A Zombie Eagle complete with squirting fish guts and nictitating membrane for. Halloween Post’ ( repost)
"Large black and white cormorant with a long ivory-colored bill. Note black "trousers" that help distinguish it from Little Pied Cormorant, which also has a shorter yellow bill. Common in marine environments, but also on inland waterways and large dams.
The Pied Cormorant mainly feeds on fish, but will also take crustaceans and molluscs. Like other cormorants, it catches prey underwater, by diving and swimming using its large, fully webbed feet for propulsion. It has special nictitating membranes that cover and protect the eyes underwater."
Starling feeding young, in the shade, in the garden. Both birds have their nictitating membrane over their eyes to protect them, dangerous game this feeding lark.
I am still unable to leave the house, as I am shielding, so garden birds it is.
The nictitating membrane is a transparent or translucent third eyelid that is present in some birds of prey and in other animals (mammals, reptiles,....). It can be drawn across the eye to protect and/or to moisten it while maintaining vision.
Tawny Eagle in Game Reserve in Kwazulu Natal, South Africa
aquila rapax
savannearend
aigle ravisseur
Raubadler oder Savannenadler
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Osprey (Pandion Haliaetus). This osprey is very clearly showing the nictitating mebrane. When diving after fish, Ospreys can completely submerge themselves underwater and still be able to fly away with their prey. Most other fish-eating birds of prey can only pluck fish from the surface of the water as they fly by.
When they dive into the water, Osprey close their third eyelid – called a nictitating membrane – which is semi-transparent. It acts like goggles and helps them see clearly beneath the water.
I love the tones of white and gold. And the water rings and green lily pads on the pool's surface.
I love the mystery of this water lily scene ... especially the water ring that is rising up between the real stem and the shadow stem that is heading down below.
What makes this water ring form? Within the body of a liquid, forces of adjoining molecules cancel each other out, above/below, side to side. But on the surface, there's no attractive force from above so the net inward force causes surface molecules to contract and to resist being stretched or broken. This surface tension allows small insects and lizards (such water striders and basilisks) to "walk on water" since their weight is not enough to penetrate the membrane.
Fairchild Tropical Botanic Garden, Miami FL
Discovered this little house somewhere around 16 inches tall, and 16 inches long, 12 inches wide. A perfect Textural Tuesday capture.
A close crop from the other side of the water. Thanks again Steve for letting me use your shoulder as a tripod.
The nictitating membrane is designed to protect and moisturise the eye whilst maintaining vision. You often see this deployed by birds such as Herons & Kingfishers to protect themselves either when fishing or sparring.
Posted as I liked the colour match with the plant in the foreground.
Taken in Suffolk.
Spring is here. A Magpie is working hard to collect nesting materials. ln the right light the feather of the Magpies will appear blue. Also, the nictitating membrane will appear kind of blue.
Local park in North of Edmonton. A sunny afternoon. Apr. 2022.
Photo is copyrighted. All rights reserved. Please do not use the photo without permission. Thank you for viewing and comments.
I shot this photo yesterday in the late afternoon. The heron was just sitting on a high branch, occasionally preening. This image isn't sharp due to some of the bird's movement, except for the unusually clear nictitating membrane that was probably moving back across the eye at the same rate that the head was shifting forward.
While i have a Curlew theme running i have a couple of others that i think are worth sharing.
A bit of a timing fluke to capture the clear membrane half way across the eye.
Bush stone-curlew. Burhinus grallarius.
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The nictitating membrane (from Latin nictare, to blink) is a transparent or translucent third eyelid present in some animals that can be drawn across the eye from the medial canthus to protect and moisten it while maintaining vision
Here is a closeup image of a king penguin, showing a bit of detail in the plumage, beak and eye. The penguin's nictitating membrane is covering half the eye. The membrane is used to protect the eye while still allowing it to see.
Series of three images. I only became aware that this hawk has lost his right eye when I was reviewing my images! I've posted a head-on shot and one showing his right side. At first I thought it was his nictitating membrane, but unfortunately it is not. This is the same hawk (I believe) that I photographed about 2 weeks ago, and he was intact then.
This bird foraged for a while, then preened, and finally began pounding tthe water with its wings, perhaps to finish its feather-care program. Note the closed nictitating membrane. The pink blossoms floating in the water complemented ithe roseate hues of its plumage.
(Platalea ajaja in breeding plumage Sarasota, FL.)
Sarasota, FL (10 March, 2022)
The nictitating membrane (from Latin nictare, to blink) is a transparent or translucent third eyelid present in some animals that can be drawn across the eye from the medial canthus to protect and moisten it while maintaining vision. Wikipedia
The membrane of the raw egg has medicinal uses as it is anti inflammatory and helps in healing wounds.
This Yellow-crowned Night Heron is enjoying a shrimp. The eyelid which marches across the eye from beak side towards the back of the head rather than up and down is called a nictitating membrane and serves to lubricate the eye.
Clearwater, Florida. 10/28/2018.
Deployed to provide protection when doing hazardous activities - whilst still allowing a degree of vision.
March 22, 2024
Photographed on Fomapan 100, developed in Thornton 2-Bath.
Camera: Intrepid 5x7 with the 8.5" Kodak Commercial Ektar
Fomapan is a lovely film - easy to work with and it produces excellent negatives. It's nice that it's far less costly than the bigger brand names too.
My Common Tern assistant has graciously volunteered to illustrate an important use of the nictitating membrane. This membrane is like a third eyelid that that engages from front to back. Its purpose is eye protection and moisturizing. In this case, this fish is not going down without a fight. Translucent eyewear, engage! July 2019
Ice Plant: Delosperma is a genus of around 170 species of succulent plants, formerly included in Mesembryanthemum in the family Aizoaceae. It was defined by English botanist N. E. Brown in 1925.The genus is common in southern and eastern Africa.
Plants of the genus Delosperma can be distinguished by their seed capsules. When these open (in response to rain), the seeds are exposed and not covered by a protective membrane, like those of most other plants in the family.
Ruth Bancroft, whose Garden I have been visiting almost continuously for a year, love ice plant. This is a very common succulent in California especially in public places and on freeway median strips. It grows like wildfire, "comes in" many colors, all vibrant, will continue its growth for years and, if you're not careful, trip you up at the Martinez Slough, Monterey Boardwalk, and Coyote Hills. But at least the succulent leaves will break your fall.
Closer crop of this very accommodating sparrowhawk taken in the garden, clearly showing in more detail, the NICITATING MEMBRANE which is a transparent or translucent third eyelid that can be drawn across the eye for protection and to moisten it while maintaining vision.
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