Cows
Cows know their calves' voices, and dairy takes the calves away
By WhyStopHarmingAnimals.com
A cow knows the sound of her own calf, and the calf knows hers[2]. In dairy farming, that calf is usually taken away within hours of birth so the milk can be sold. About 305 million cows were slaughtered in 2024, roughly 835,000 every day, and many of them were mothers who had already lost calves this way.
The science on cow minds has been around for years[6]. The public picture of cows as dull, placid animals has simply not kept up with it[6].
Mother and calf
In playback experiments published in Animal Behaviour in 2016, researchers played recorded calls to cows and their calves[2]. Mothers were more likely to look, turn or walk toward the call of their own calf than the call of an unfamiliar calf[2]. The recognition ran both ways: calves responded more to their own mother's voice[2].
That bond is exactly what a dairy system is set up to break. The milk the calf would have drunk is the product, so the farm separates them, usually within hours. Beef cows live short lives. Dairy cows live longer ones that end in the same slaughterhouse, with calves taken from them along the way.
They notice when they get it right
In a 2004 study in Applied Animal Behaviour Science, Hagen and Broom gave Holstein-Friesian heifers a task they had to learn in order to get a food reward[3]. Another group of cows received the same rewards without having to learn anything[3]. At the moment of success, the heifers who had worked it out showed higher heart rates and more behavioral excitement, including more ear movement, than the cows who were simply handed the treats[3].
The food was identical, so the difference came from solving the problem[3]. The authors read it as evidence that cows evaluate their own learning[3]. The study is observational and the reaction is measured from outside, but it is hard to explain without an animal who cares that she figured something out.
A cow with a broom
Veronika is a pet cow in Austria. She uses a deck brush to scratch herself, choosing the bristled end for most of her body and switching to the stick end for softer areas lower on her body[4]. A paper in Current Biology in 2026 described this as flexible, multi-purpose tool use, adapting one object to different functions[4]. It is the first scientific report of tool use by a cow[4], and that kind of flexible use is rarely documented outside primates.
It is one animal, so it shows what a cow can do rather than what every cow does[4]. The authors argue that farm-animal cognition needs a reassessment[5], and a single cow with a broom is enough to put the old assumption in doubt. As The New York Times put it in covering the study, cows have not been celebrated for their smarts[5].
Friends, personalities and emotion
A 2017 review in Animal Behavior and Cognition, "The psychology of cows," pulls the wider research together[6]. Cows show individual personalities, complex social lives, learning and emotion[6]. They form preferred social partners, they play, and they show stress when a companion is taken away. The authors wrote the review because the evidence already existed and the way people think about cows had not caught up[6].
What the numbers leave out
The 305 million cows killed in 2024 are a small share of the 87.9 billion land animals slaughtered that year[1], but they carry most of the land and climate cost of animal farming. Each of them was an animal who could recognize a voice[2], keep a friend and react to her own success[3]. Dairy depends on separating mothers and calves who know each other[2], and none of us needs dairy or beef to be well fed.