29/09/2026
A RURAL EDUCATION FOR A NATURAL ENGLAND
Just One Sheep Has Been Vital To Our Cultural Heritage & Many Of Our Treasured Environments
Leigh Onslow ©️2026
Very few people outside farming communities truly understand what a heft is or what being hefted means. Many still believe is just a group of sheep mysteriously occupying an area of unfenced land, or that is it merely a living, intergenerational relationship between animals and place.
However contemporary research advances their meaning far beyond those very basic, commonly interpreted dictionarial definitions.
The thinking behind what has been more recently embraced, is that a heft is an invisible architecture built over decades and sometimes centuries, in which an individual sheep is part of a flock, the flock is part of a landscape, and the landscape is inseparable from the shepherd, the sheepdog, the farming family and the wider rural community. It is therefore being identified as part of our cultural heritage, and something far more important than any dictionary currently defines it as.
So why does a heft start with a single ewe ? That is the question that my students ask me all the time. My answer is simple, it is she and only she that lays down the ground rules which are initially created from the scent that comes from the interdigital gland between her toes.
The foundation and the heart of a heft are always the matriarchs, experienced older ewes whose knowledge of the ground has been acquired through a lifetime of movement across it. A matriarch reads the slope, navigates the stones on the edge of a precipice, assesses the soil for boggy land, selects suitable different areas of vegetation with food value at certain times of the year, finds appropriate shelter from adverse weather and creates a mosaic of routes with her scented feet; she is wise because she has gained life experiences so she knows where to graze, where to rest, where to cross, where danger may lie and where she can escape from danger.
Current research is evidencing that her scent, expressed from that interdigital gland between her toes, becomes increasingly stronger and more distinctive with maturity, and that scent accompanies her movements, creating olfactory, visual, social and topographical cues woven together through repetition and learning for the younger in the flock.
Lambs and younger sheep follow their mothers and other sheep for a reason, they are following paths and ways (some more evident to the human eye than others) and these are all scented (some far more scented than others). The stronger the scent the more the flock are drawn in to follow.
This way younger sheep are gaining knowledge and accumulated experience. In time, paths and areas become strongly scented and familiar to the young, so grazing places become established, escape routes become known, and in that way home (the heft) becomes part of the flock’s collective memory because of the scent. What is also interesting is that no two flock’s scent are identical and this is part of the research being undertaken currently. The result will lead us to a further scientific explanation as to why each flock keeps rigidly to its own established heft without a fence between them
Once a flock is hefted (belongs) to a heft, generation by generation, the knowledge of one matriarch becomes the inheritance of another, including information to influence paths and grazing areas which may subtly improve the heft: Where water is available in a drought, where to sleep in a storm when strong winds blow on their face from any point of a compass.
To watch this detailed interaction between sheep and their environment is something most shepherds take for granted, because how their sheep, their sheepdogs and they too respond to various things life throws at them has, over time, become intuitive and interactive with everything.
Once we accept that a heft cannot be adequately represented by drawing a line around a piece of land. We can start to see how the heft is carried by hefted animals and the people that interact closely with them, reinforced through movement and embedded in the landscape itself.
A flock does not simply occupy parts of the countryside; it participates in it. Its grazing is selective and patterned, moving through some places and leaving others, interacting with vegetation, birds, mammals, insects and other livestock, while the terrain in turn shapes the behaviour of the flock.
Across millions of acres, individual hefts sit beside and interact with other habitats and hefts, creating a vast and largely invisible knitting together of the British countryside. In fact all fauna and flora heft in some way or other, but sheep are definitely the masters from whom we can learn so much more about hefting behaviour.
The shepherd and the sheepdog are woven into this system just as profoundly. So too are the farming families and the neighbouring farming communities. Knowledge passes between people and animals, between generations and across farms. The economy of the countryside, the character of its landscapes and the continuity of its cultural heritage are all connected to these relationships. Even phenomena that appear to have little connection with sheep vegetation structure, habitat mosaics and the vegetation across open landscapes are influenced positively by where and how established hefted flocks travel, browse and graze. The flock is therefore not simply on the landscape. Over generations, it becomes one of the things through which the landscape functions.
And this is where the danger of treating hefts as merely livestock farms, sheep farms, tenant grazing, commoners or crofters rights suddenly becomes hugely apparent. Moving a strongly hefted flock (or hefted herd of other animals or birds) is definitely not equivalent to moving animals simply from one neighbouring place or field to another. A long established flock carries an incredible knowledge of place and that knowledge relates to weather, climate, season, the luna month and even the time of day. Its mature animals carry experience that lambs and gimmers have yet to start to properly acquire; its routes have been learned, its relationships established and its behaviour reinforced through generations and if broken are at the flock’s peril too. Remove the flock from the landscape and one removes far more than sheep. It immediately stops the transmission of knowledge between generations, severs all relationships between animals and terrain, alters established patterns of grazing and eradicates a network of human and ecological relationships whose significance is almost impossible to quantify or see once it has gone.
Over about 10-15 years (the lifetime of a native homebred ewe) the disruption and resulting carnage of loosing a heft, (which would adversely affect all pieces of its living jigsaw), would be catastrophic. Not only to those integrated pieces but it would be sorely regretted by even those outside the heft that never became close enough to truly embrace it.
The irony is that the more successful a heft has been, the less visible its work becomes. When generations of sheep, shepherds and sheepdogs are part of a landscape in certain weather at certain times of the year, intuitively follow scent on the ground or carried on the wind and understand how each other move because of it.
When vegetation is continually shaped by patterned grazing that few can read and when the landscape remains productive and resilient with continuous grass and forage growth, the visible impact can appear to those that cannot yet grasp the heft, as anything from overgrazing to environmental degradation.
Some even naively try to compare lowland availability of grass as good animal welfare to the uplands less availability of foraging and the animal welfare of those sheep. It is naivety like that which creates conflict. So to spell that out let’s rid that myth here and now. Uplands and places with challenging topography require animals to be healthy, lean & fit enough for that terrain. Generally a genetic predisposition to being athletic, robust, hardy and with a metabolism and digestive system that suits their environment. Hefted flocks benefit from all of these attributes and thrive in a free, natural and semi feral way with the landscape. So long as the flock are managed and not allowed to outgrow their heft they will not expand their heft and shepherds themselves are perfectly capable of managing that on their own.
Hefted flocks in harsh environments are not hefty fancy inblown’s attempting to thrive in an unsuitable or unsustainable environment. Sheep that live and thrive in what are perceived as challenging environments to humans, are athletes of the highest order in the sheep world, and they are extraordinarily resilient, strong, intuitive and feisty creatures with a metabolism that most other sheep would die for.
You cannot just think you can always replace a hefted flock with any other sheep to conservation graze. Hefted flocks are irreplaceable in terms of genetic and other adaptations that have occurred to bond them strongly with their heft and so is anything else that strongly interacts with them, be that fauna or flora, nothing in a heft is untouched by this complex interaction.
This hefting has been described as a phenomenon in the past, and to some extent it was because nobody was getting to grips with what the hefted are. We are steadily finding out that hefting is far more than just the product of accumulated intelligence, adaptation, genetics, memory and trust between species, maintained over extraordinary periods of time. It is a whole new world based on scented matriarchal footsteps into the unknown.
So a heft really has nothing to do with an absence of fencing at all. It is the presence of knowledge and memory made visible through movement through a landscape scented, marked and remembered. That may sound romantic to some, however it is a reality and the science that is exposing it is thankfully opening up some very closed minds
An old crofter once shouted instructions at me (many decades ago). Those words were something along the lines of:
“Cha bu chòir dhut na h-uain a chaidh an cur air falbh bho’n mhàthair a leigeil a-mach an-diugh mus leig thu na seann chaoraich neo-thorrach a-mach a-màireach, air neo bidh iad air am bàthadh, no thèid iad sìos a’ chlais ud agus bidh iad air chall ro mhadainn.” Then he pointed to his head and said “Feumaidh tu nad inntinn tuigsinn mar a tha treud heftte ag ionnsachadh an fhearainn”
Then:
““Cha deach an heft a-steach do na cnàmhan agad fhathast. Tha thu coltach ris na h-uain a chaidh an cur air falbh bho’n mhàthair — chan eil fios agad fhathast ciamar a lorgas tu do shlighe a-mach à trioblaid le d’ fhàileadh. Ach fuirich còmhla riutha fada gu leòr, agus fiù ’s anns an dorchadas, fàilichidh tu an t-slighe.”
For the benefit of those who do not speak Gaelic here is a rough translation of what he was trying to teach me:
“You shouldn’t let those lambs out today before the old barren ewes go out tomorrow because those new lambs don’t know the land and they’ll be drowned, down that ravine or be lost before morning…… You need to be hefted with them in your mind”
Then
“The heft hasn’t seeped into your bones yet, you are like those weaned lambs, you don’t know how to smell your path out of trouble yet, but be with them long enough and even in the dark you’ll smell it”
And once all this is understood, the implications of disrupting a heft become very different. The question is no longer simply whether sheep should be allowed to graze a particular area. The question is what knowledge, ecological relationships, cultural heritage and landscape function may be lost when a living system that has taken generations to develop is interrupted.
We should be extremely careful about dismantling systems whose complexity we have not yet fully understood. The countryside is not merely land upon which policy should be blindly imposed. It is a living tapestry in which animals, people and place have been learning from one another for generations. Hefted flocks are among its oldest threads. A Six thousand year old tapestry with cultural and farming heritage intricately and intimately sewn into it. We may not always be able to see the threads of that tapestry, but that does not mean they are not holding the tapestry together.
Leigh Onslow
Part of a 2016-2026 Research Project
©️Hefted Flocks, Cultural Significance & Conservation
