{"id":2556,"date":"2025-06-13T07:24:53","date_gmt":"2025-06-13T04:24:53","guid":{"rendered":"https:\/\/cagefreegreece.org\/?page_id=2556"},"modified":"2025-09-08T12:41:09","modified_gmt":"2025-09-08T09:41:09","slug":"learn-about-hens","status":"publish","type":"page","link":"https:\/\/cagefreegreece.org\/en\/learn-about-hens\/","title":{"rendered":"Learn about hens"},"content":{"rendered":"\t\t
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Learn about hens<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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Did you know that...?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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All domesticated hens (gallus gallus domesticus) come from the wild hens (gallus gallus) that live in the forests of India and South-East Asia (Burma, Malaysia, Thailand and Cambodia). They were domesticated 8.000 years ago and were introduced into the Middle East and Egypt in the second millennium BC, into Europe in the first millennium BC and into the Americas in the 16th century.<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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\n\t\t\t\t\t\t\n\t\t\t\t\t\t\tIn their natural habitat, the lifespan of a hen is about ten years.\t\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/h3>\n\t\t\t\t\n\t\t\t\t\n\t\t\t<\/div>\n\t\t\t\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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\n\t\t\t\t\t\t\n\t\t\t\t\t\t\tAn adult hen weighs between 3 and 4 kilograms, about the same as a cat.\t\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/h3>\n\t\t\t\t\n\t\t\t\t\n\t\t\t<\/div>\n\t\t\t\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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\n\t\t\t\t\t\t\n\t\t\t\t\t\t\tTheir eyes do not move, but this immobility is compensated by ceaseless movements of the head.\t\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/h3>\n\t\t\t\t\n\t\t\t\t\n\t\t\t<\/div>\n\t\t\t\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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\n\t\t\t\t\t\t\n\t\t\t\t\t\t\tLike humans, they can distinguish red, green and blue light, as well as violet light which is at the boundaries of the visible spectrum, but also ultraviolet light which is invisible to the human eye. Because their eyes are so sensitive to infrared light, they can detect dawn up to an hour earlier than humans, which is why roosters crow when we think it's still night.\t\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/h3>\n\t\t\t\t\n\t\t\t\t\n\t\t\t<\/div>\n\t\t\t\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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\n\t\t\t\t\t\t\n\t\t\t\t\t\t\tHens don't have teeth, they swallow gravel and their stomach muscles masticate food together with the stones to grind it. They eat whatever they find on the ground: seeds, grass, leaves, small pebbles, worms or insects.\t\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/h3>\n\t\t\t\t\n\t\t\t\t\n\t\t\t<\/div>\n\t\t\t\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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\n\t\t\t\t\t\t\n\t\t\t\t\t\t\tThey dig the ground and roll in the dust to clean and insulate their wings from lice. \t\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/h3>\n\t\t\t\t\n\t\t\t\t\n\t\t\t<\/div>\n\t\t\t\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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\n\t\t\t\t\t\t\n\t\t\t\t\t\t\tThey sleep perched on a branch, all in a row, with a sentinel at each end who sleeps with one eye open to watch over the others. In the middle of the night, sentinels switch sides so the other half of the brain can rest!\t\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/h3>\n\t\t\t\t\n\t\t\t\t\n\t\t\t<\/div>\n\t\t\t\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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Think<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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The intelligence of hens has been documented many times. They can solve complex problems, understand cause and effect, they have memory and can plan for the future.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Are gifted with empathy<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Studies show that hens sense and empathize when their young or other hens are in distress or in danger, regardless of distance. (Edgar et al., 2011)<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Learn<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Hens are overprotective of their young. Mother hens begin to train them while the chicks are still inside the eggs, communicating with them through vocalizations and purrs, and chicks respond with titters. Later, mother hen teaches them what is safe to eat and what is not.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Learn<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Chickens also learn from personal experience. If they are given plain grains and grains of another colour with an anti-inflammatory substance, they perceive the effect of the substance and when they have a wound, they will selectively consume the anti-inflammatory. (Danbury et al., 2000)<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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When a hen acquires a knowledge or a behaviour, this behaviour is spread and copied by all hens throughout the coop or the unit. In experimental conditions, it was recorded that hens can also learn behaviors from a screen. (PMAF, n.d.)<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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Comprehend<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Two days after they are born, chickens are already able to mentally calculate quantities of up to 5 objects. In addition, they understand the “permanence of objects”, i.e. that objects continue to exist even when they are not in their field of vision, a skill they perfect as they grow older.<\/p>

Hens are able to distinguish, between two photographs, the one which pictures the hen they know, even if the photograph shows the animal at a younger age or only part of its body. (Domken & Zayan, 1998)<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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They have social organization and multisensory communication<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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They have a strict social hierarchy (pecking order), with some animals dominating over others. Subordinate chickens mimic the behaviour of the dominant one.\u00a0<\/p>

They use a rich array of sophisticated vocalizations to communicate with each other, with over 30 calls and warnings, each with a different meaning. Warning for danger coming from above is different from warning for a land threat. Scientists compare their communication<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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\u201c\u039f\u03b9 \u03cc\u03c1\u03bd\u03b9\u03b8\u03b5\u03c2 \u03ad\u03c7\u03bf\u03c5\u03bd \u03b1\u03bd\u03b1\u03bc\u03c6\u03b9\u03c3\u03b2\u03ae\u03c4\u03b7\u03c4\u03b1 \u03c0\u03b5\u03c1\u03b9\u03c3\u03c3\u03cc\u03c4\u03b5\u03c1\u03b5\u03c2 \u03b9\u03ba\u03b1\u03bd\u03cc\u03c4\u03b7\u03c4\u03b5\u03c2 \u03b1\u03c0\u2019 \u03cc,\u03c4\u03b9 \u03bd\u03bf\u03bc\u03af\u03b6\u03bf\u03c5\u03bc\u03b5, \u03b1\u03bb\u03bb\u03ac \u03bc\u03b1\u03c2 \u03b2\u03bf\u03bb\u03b5\u03cd\u03b5\u03b9 \u03c8\u03c5\u03c7\u03bf\u03bb\u03bf\u03b3\u03b9\u03ba\u03ac \u03bd\u03b1 \u03c5\u03c0\u03bf\u03b2\u03b9\u03b2\u03ac\u03b6\u03bf\u03c5\u03bc\u03b5 \u03c4\u03b1 \u03b6\u03ce\u03b1 \u03c0\u03bf\u03c5 \u03c7\u03c1\u03b7\u03c3\u03b9\u03bc\u03bf\u03c0\u03bf\u03b9\u03bf\u03cd\u03bc\u03b5 \u03c9\u03c2 \u03c4\u03c1\u03bf\u03c6\u03ae.\u201d<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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\u2014 Dr. Siobhan Abeyesinghe, Royal Veterinary College (UK)<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

Did you know that…? All domesticated hens (gallus gallus domesticus) come from the wild hens (gallus gallus) that live in the forests of India and South-East Asia (Burma, Malaysia, Thailand and Cambodia). They were domesticated 8.000 years ago and were introduced into the Middle East and Egypt in the second millennium BC, into Europe in […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"elementor_header_footer","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"class_list":["post-2556","page","type-page","status-publish","hentry"],"yoast_head":"\nLearn about hens - Cage-Free Greece, \u0391\u03bd\u03b8\u03c1\u03ce\u03c0\u03b9\u03bd\u03b5\u03c2 \u03c3\u03c5\u03bd\u03b8\u03ae\u03ba\u03b5\u03c2 \u03b5\u03ba\u03c4\u03c1\u03bf\u03c6\u03ae\u03c2 \u03b3\u03b9\u03b1 \u03c4\u03b9\u03c2 \u03cc\u03c1\u03bd\u03b9\u03b8\u03b5\u03c2<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/cagefreegreece.org\/en\/learn-about-hens\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Learn about hens - Cage-Free Greece, \u0391\u03bd\u03b8\u03c1\u03ce\u03c0\u03b9\u03bd\u03b5\u03c2 \u03c3\u03c5\u03bd\u03b8\u03ae\u03ba\u03b5\u03c2 \u03b5\u03ba\u03c4\u03c1\u03bf\u03c6\u03ae\u03c2 \u03b3\u03b9\u03b1 \u03c4\u03b9\u03c2 \u03cc\u03c1\u03bd\u03b9\u03b8\u03b5\u03c2\" \/>\n<meta property=\"og:description\" content=\"Did you know that…? All domesticated hens (gallus gallus domesticus) come from the wild hens (gallus gallus) that live in the forests of India and South-East Asia (Burma, Malaysia, Thailand and Cambodia). 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