Calves are fed a probiotic supplement called "Kowbucha," which has been shown to reduce the methane that they produce, as part of a trial at a Massey University's research farm in Palmerston North, New Zealand, September 7, 2022. REUTERS/Lucy Craymer 

The Fonterra Research and Development Centre is pictured in Palmerston North, New Zealand, September 7, 2022. REUTERS/Lucy Craymer 

Shalome Bassett, the principal scientist at the Fonterra Research and Development Centre, poses for a photograph in Palmerston North, New Zealand, September 7, 2022. REUTERS/Lucy Craymer 

Palmerston, the Foreign Office cat, is seen outside Downing Street in London, Britain March 11, 2020. REUTERS/Toby Melville 

Palmerston, the Foreign Office cat, is seen outside of Downing Street in London, Britain, April 2, 2019. REUTERS/Toby Melville 

Palmerston, the Foreign Office cat, sits at the photographer's ladder outside of Downing Street in London, Britain, February 12, 2019. REUTERS/Toby Melville 

Palmerston, the Foreign Office cat, sits at the photographer's ladder outside Downing Street in London, Britain, February 12, 2019. REUTERS/Toby Melville 

Larry the Downing Street cat and Palmerston the Foreign Office cat square off outside Britain's Prime Minister's official residence 10 Downing Street, London, January 29, 2018. REUTERS/Toby Melville 

Larry the Downing Street cat walks past Palmerston the Foreign Office cat on Downing Street in London, Britain, June 12, 2017. REUTERS/Stefan Wermuth 

Palmerston, the Foreign Office cat, stands outside 10 Downing Street in London, Britain, May 4, 2017. REUTERS/Toby Melville 

Palmerston, the Foreign Office cat, sits outside 10 Downing Street in London, Britain, May 4, 2017. REUTERS/Toby Melville 

Palmerston (R) and Larry (L), resident cats of the Foreign and Commonwealth Office and 10 Downing Street respectively, sit on the boundaries of each other's residences facing each other in Downing Street in central London, Britain, September 14, 2016. REUTERS/Toby Melville 

Britain's Prince Harry meets with army nurses during his visit to Linton Military Camp near Palmerston North, May 13, 2015. Prince Harry is on a week-long tour of New Zealand. REUTERS/Mark Mitchell/POOL 

Britain's Prince Harry meets with army nurses during his visit to Linton Military Camp near Palmerston North, May 13, 2015. Prince Harry is on a week-long tour of New Zealand. REUTERS/Mark Mitchell/POOL 

Britain's Prince Harry (2nd R) speaks with Sergeant Major Alan Brill (L-R), Palmerston North mayor Grant Smith and Warrant Officer 1 Clive Douglas during his visit to Linton Military Camp near Palmerston North, May 13, 2015. Prince Harry is on a week-long tour of New Zealand. REUTERS/Mark Mitchell/POOL 

Britain's Prince Harry hongis with Kairanga kapa haka group performer Riria Arapere during his visit to Linton Military Camp near Palmerston North, May 13, 2015. Prince Harry is on a week-long tour of New Zealand. REUTERS/Mark Mitchell/POOL 

Britain's Prince Harry hongis with Kairanga kapa haka group performer Anicacane Papanui during his visit to Linton Military Camp near Palmerston North, May 13, 2015. Prince Harry is on a week-long tour of New Zealand. REUTERS/Mark Mitchell/POOL 

Britain's Prince Harry applauds the Kairanga kapa haka group performers during his visit to Linton Military Camp near Palmerston North, May 13, 2015. Prince Harry is on a week-long tour of New Zealand. REUTERS/Mark Mitchell/POOL 

Britain's Prince Harry receives a hongi from a member of the Kairanga Kapa Haka group during his visit to Linton Military Camp near Palmerston North, May 13, 2015. Prince Harry is on a week-long tour of New Zealand. REUTERS/Hagen Hopkins/POOL 

Britain's Prince Harry speaks to members of the Nursing Corp during his visit to Linton Military Camp near Palmerston North, May 13, 2015. Prince Harry is on a week-long tour of New Zealand. REUTERS/Hagen Hopkins/POOL 

Britain's Prince Harry meets a member of the Nursing Corp during his visit to Linton Military Camp near Palmerston North, May 13, 2015. Prince Harry is on a week-long tour of New Zealand. REUTERS/Hagen Hopkins/POOL 

Britain's Prince Harry receives a hongi from a member of the Kairanga Kapa Haka group during his visit to Linton Military Camp near Palmerston North, May 13, 2015. Prince Harry is on a week-long tour of New Zealand. REUTERS/Hagen Hopkins/POOL 

Britain's Prince Harry receives a hongi from a member of the Kairanga Kapa Haka group during his visit to Linton Military Camp near Palmerston North, May 13, 2015. Prince Harry is on a week-long tour of New Zealand. REUTERS/Hagen Hopkins/POOL 

Britain's Prince Harry watches a kapa haka group perform during his visit to Linton Military Camp near Palmerston North, May 13, 2015. Prince Harry is on a week-long tour of New Zealand. REUTERS/Hagen Hopkins/POOL 

Britain's Prince Harry speaks to military personnel during his visit to Linton Military Camp near Palmerston North, May 13, 2015. Prince Harry is on a week-long tour of New Zealand. REUTERS/Hagen Hopkins/POOL 

Britain's Prince Harry speaks to military personnel during his visit to Linton Military Camp near Palmerston North, May 13, 2015. Prince Harry is on a week-long tour of New Zealand. REUTERS/Hagen Hopkins/POOL 

Britain's Prince Harry prepares to drive an LAV (light armoured vehicle) during his visit to Linton Military Camp near Palmerston North, May 13, 2015. Prince Harry is on a week-long tour of New Zealand. REUTERS/Anthony Phelps 

Britain's Prince Harry walks past Anzac Day crosses during his visit to Linton Military Camp near Palmerston North, May 13, 2015. Prince Harry is on a week-long tour of New Zealand. REUTERS/Anthony Phelps 

Britain's Prince Harry waves as he leaves Linton Military Camp near Palmerston North, May 13, 2015. Prince Harry is on a week-long tour of New Zealand. REUTERS/Anthony Phelps 

Britain's Prince Harry talks to children from Linton base school during his visit to Linton Military Camp near Palmerston North, May 13, 2015. Prince Harry is on a week-long tour of New Zealand. REUTERS/Anthony Phelps 

Britain's Prince Harry waves from a helicopter as he leaves Linton Military Camp near Palmerston North, May 13, 2015. Prince Harry is on a week-long tour of New Zealand. REUTERS/Anthony Phelps 

Britain's Prince Harry waves from a helicopter as he leaves Linton Military Camp near Palmerston North, May 13, 2015. Prince Harry is on a week-long tour of New Zealand. REUTERS/Anthony Phelps 

Britain's Prince Harry talks to children after he played touch rugby during his visit to Linton Military Camp near Palmerston North, May 13, 2015. Prince Harry is on a week-long tour of New Zealand. REUTERS/Anthony Phelps TPX IMAGES OF THE DAY

Britain's Prince Harry talks to children from Linton camp school he played touch rugby with during his visit to Linton Military Camp near Palmerston North, May 13, 2015. Prince Harry is on a week-long tour of New Zealand. REUTERS/Anthony Phelps 

Britain's Prince Harry plays touch rugby with children from Linton camp school during his visit to Linton Military Camp near Palmerston North, May 13, 2015. Prince Harry is on a week-long tour of New Zealand. REUTERS/Anthony Phelps 

Britain's Prince Harry plays touch rugby with children from Linton camp school during his visit to Linton Military Camp near Palmerston North, May 13, 2015. Prince Harry is on a week-long tour of New Zealand. REUTERS/Anthony Phelps 

Britain's Prince Harry plays touch rugby with children from Linton camp school during his visit to Linton Military Camp near Palmerston North, May 13, 2015. Prince Harry is on a week-long tour of New Zealand. REUTERS/Anthony Phelps 

Britain's Prince Harry plays touch rugby with children from Linton camp school during his visit to Linton Military Camp near Palmerston North, May 13, 2015. Prince Harry is on a week-long tour of New Zealand. REUTERS/Anthony Phelps 

Britain's Prince Harry plays touch rugby with children from Linton camp school during his visit to Linton Military Camp near Palmerston North, May 13, 2015. Prince Harry is on a week-long tour of New Zealand. REUTERS/Anthony Phelps 

Britain's Prince Harry plays touch rugby with children from Linton camp school during his visit to Linton Military Camp near Palmerston North, May 13, 2015. Prince Harry is on a week-long tour of New Zealand. REUTERS/Anthony Phelps 

Britain's Prince Harry drives an ATV (all terrain vehicle) during his visit to Linton Military Camp near Palmerston North, May 13, 2015. Prince Harry is on a week-long tour of New Zealand. REUTERS/Anthony Phelps 

Britain's Prince Harry (L) helps to lift the hangi (a Maori method of cooking food using heated rocks buried in a pit oven) out during his visit to Linton Military Camp near Palmerston North, May 13, 2015. Prince Harry is on a week-long tour of New Zealand. REUTERS/Anthony Phelps 

Britain's Prince Harry (L) helps to lift the hangi (a Maori method of cooking food using heated rocks buried in a pit oven) out during his visit to Linton Military Camp near Palmerston North, May 13, 2015. Prince Harry is on a week-long tour of New Zealand. REUTERS/Anthony Phelps 

Britain's Prince Harry (L) helps to lift the hangi (a Maori method of cooking food using heated rocks buried in a pit oven) out during his visit to Linton Military Camp near Palmerston North, May 13, 2015. Prince Harry is on a week-long tour of New Zealand. REUTERS/Anthony Phelps 

Britain's Prince Harry prepares to drive an ATV (all terrain vehicle) during his visit to Linton Military Camp near Palmerston North, May 13, 2015. Prince Harry is on a week-long tour of New Zealand. REUTERS/Anthony Phelps 

Britain's Prince Harry prepares to drive an ATV (all terrain vehicle) during his visit to Linton Military Camp near Palmerston North, May 13, 2015. Prince Harry is on a week-long tour of New Zealand. REUTERS/Anthony Phelps 

Britain's Prince Harry drives an ATV (all terrain vehicle) during his visit to Linton Military Camp near Palmerston North, May 13, 2015. Prince Harry is on a week-long tour of New Zealand. REUTERS/Anthony Phelps 

Britain's Prince Harry prepares to drive an ATV (all terrain vehicle) during his visit to Linton Military Camp near Palmerston North, May 13, 2015. Prince Harry is on a week-long tour of New Zealand. REUTERS/Anthony Phelps 

Britain's Prince Harry prepares to drive an ATV (all terrain vehicle) during his visit to Linton Military Camp near Palmerston North, May 13, 2015. Prince Harry is on a week-long tour of New Zealand. REUTERS/Anthony Phelps 

Britain's Prince Harry prepares to drive an ATV (all terrain vehicle) during his visit to Linton Military Camp near Palmerston North, May 13, 2015. Prince Harry is on a week-long tour of New Zealand. REUTERS/Anthony Phelps 

Britain's Prince Harry applaudes after performing the haka with soldiers from the 1st New Zealand Brigade during his visit to Linton Military Camp near Palmerston North, May 13, 2015. Prince Harry is on a week-long tour of New Zealand. REUTERS/Anthony Phelps 

Britain's Prince Harry applaudes after performing the haka with soldiers from the 1st New Zealand Brigade during his visit to Linton Military Camp near Palmerston North, May 13, 2015. Prince Harry is on a week-long tour of New Zealand. REUTERS/Anthony Phelps 

Britain's Prince Harry performs the haka with soldiers from the 1st New Zealand Brigade during his visit to Linton Military Camp near Palmerston North, May 13, 2015. Prince Harry is on a week-long tour of New Zealand. REUTERS/Anthony Phelps 

Britain's Prince Harry performs the haka with soldiers from the 1st New Zealand Brigade during his visit to Linton Military Camp near Palmerston North, May 13, 2015. Prince Harry is on a week-long tour of New Zealand. REUTERS/Anthony Phelps 

Britain's Prince Harry (C back) performs the haka with soldiers from the 1st New Zealand Brigade during his visit to Linton Military Camp near Palmerston North, May 13, 2015. Prince Harry is on a week-long tour of New Zealand. REUTERS/Anthony Phelps 

Britain's Prince Harry performs the haka with soldiers from the 1st New Zealand Brigade during his visit to Linton Military Camp near Palmerston North, May 13, 2015. Prince Harry is on a week-long tour of New Zealand. REUTERS/Anthony Phelps 

Britain's Prince Harry performs the haka with soldiers from the 1st New Zealand Brigade during his visit to Linton Military Camp near Palmerston North, May 13, 2015. Prince Harry is on a week-long tour of New Zealand. REUTERS/Anthony Phelps 

Britain's Prince Harry performs the haka with soldiers from the 1st New Zealand Brigade during his visit to Linton Military Camp near Palmerston North, May 13, 2015. Prince Harry is on a week-long tour of New Zealand. REUTERS/Anthony Phelps 

Britain's Prince Harry performs the haka with soldiers from the 1st New Zealand Brigade during his visit to Linton Military Camp near Palmerston North, May 13, 2015. Prince Harry is on a week-long tour of New Zealand. REUTERS/Anthony Phelps TPX IMAGES OF THE DAY

Britain's Prince Harry (2nd L) drives an ATV (all terrain vehicle) during his visit to Linton Military Camp near Palmerston North, May 13, 2015. Prince Harry is on a week-long tour of New Zealand. REUTERS/Anthony Phelps