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The practice, which the RSPCA says is on the rise, involves cutting off part of the animal's ear.
BBC News Science & Environment
Perseverance rover begins its exploration of Mars
The one-tonne robot wiggles its wheels before rolling forwards across Jezero Crater's dusty terrain.
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Perseverance rover begins its exploration of Mars
The one-tonne robot wiggles its wheels before rolling forwards across Jezero Crater's dusty terrain.
Government has no climate change plan - MPs
Two reports from MPs cast doubt on the government's approach to meeting its climate change goals.
Climate threats to historic sites identified
The map will help to plan interventions such as tree planting and peat bog restoration.
Close-up view of crack that made mega-iceberg
A UK satellite peeps through the clouds to see the great rift that produced a near-500-sq-mile berg.
Then and now: A 'megadrought' in California
See how extreme weather has affected an vital reservoir in California.
World's 'oldest wild bird' has chick at age of 70
Wisdom is believed to have had more than 30 chicks in her life so far, and several partners.
Over 900 million tonnes of food wasted each year
Every year, 23 million truckloads of food go straight into the waste bin, according to the UN.
Featured Contents
Perseverance rover begins its exploration of Mars
The one-tonne robot wiggles its wheels before rolling forwards across Jezero Crater's dusty terrain.
Government has no climate change plan - MPs
Two reports from MPs cast doubt on the government's approach to meeting its climate change goals.
Climate threats to historic sites identified
The map will help to plan interventions such as tree planting and peat bog restoration.
Close-up view of crack that made mega-iceberg
A UK satellite peeps through the clouds to see the great rift that produced a near-500-sq-mile berg.
Then and now: A 'megadrought' in California
See how extreme weather has affected an vital reservoir in California.
World's 'oldest wild bird' has chick at age of 70
Wisdom is believed to have had more than 30 chicks in her life so far, and several partners.
Over 900 million tonnes of food wasted each year
Every year, 23 million truckloads of food go straight into the waste bin, according to the UN.
Government has no climate change plan - MPs
Two reports from MPs cast doubt on the government's approach to meeting its climate change goals.
Climate threats to historic sites identified
The map will help to plan interventions such as tree planting and peat bog restoration.
Close-up view of crack that made mega-iceberg
A UK satellite peeps through the clouds to see the great rift that produced a near-500-sq-mile berg.
Space
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Video caption: Dog ear cropping: 'It's affected him in so many ways' By Steve Mather
BBC News
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Video caption: Perseverance rover goes for a short drive The one-tonne robot wiggles its wheels before rolling forwards across Jezero Crater's dusty terrain.
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Video caption: Nasa's Perseverance rover starts rolling on Mars The one-tonne robot wiggles its wheels before rolling forwards across Jezero Crater's dusty terrain.
Greenwashing- The Conscious Closet | Alice Cruickshank
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Video caption: Often your favourite fashion brands aren't as ethical as they seem, as Alice explains By Kerry Allen
BBC Monitoring
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Video caption: Owl rescued after wing trapped in fence near Winchester An unfortunate owl had to be rescued after it's wing became trapped in a fence near Winchester.
Phenomenal Photosynthesis
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Video caption: Can we improve nature's engine room- the amazing process of photosynthesis? Some food crops convert just one percent of the sun's energy into edible food. If we can improve photosynthesis we can grow more food on less land. Tom Heap investigates.
The Legal Fight
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Video caption: Taking Governments and organisations to court enforce environmental law. Is it better to take to the courts than take to the trees? Legal organisation Client Earth are taking governments and business to court to get environmental laws taken seriously.
Siberian Rewilding
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Video caption: How trees and fluffy snow are the bad guys when it comes to climate change in Siberia In Siberia a radical experiment is taking place. Can removing trees and reintroducing musk ox and other grazing animals protect the permafrost from thawing and releasing carbon.
More Power from the Sun
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Video caption: Solar energy is cheap and clean, but it could be better. Tom Heap discovers how. Electricity from the sun is cheap and clean but the solar cells we see on our rooftops could be much more efficient. Tom Heap meets the innovator shaking up the world of solar.
Chilling Food
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Video caption: A fresh way to keep food cool and cut food waste. Chilled lorries keep our food fresh on route to the supermarket, but they have a dirty secret- their fridges run on diesel. Tom Heap meets the team behind a cleaner alternative.
The First Five Fascinating Ideas
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Video caption: Beating climate change takes the best ideas from the smartest minds. Beating climate change takes the best ideas from the smartest minds. Tom Heap offers up the first five bold ideas to cut carbon.
Educating and Empowering Girls
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Video caption: How does ensuring girls get a full education help fight climate change? Many girls around the world drop out of school before completing their education. Ensuring they remain in school empowers them but it can also bring benefits for the climate.
