Stop harvesting olives at night — it kills millions of songbirds (2024)

  • CORRESPONDENCE
  • Correction 24 May 2019
    By
  • Luis P. da Silva &
  • Vanessa A. Mata1
  1. Luis P. da Silva

    You can also search for this author in PubMed Google Scholar

  2. Vanessa A. Mata
    1. Research Center in Biodiversity and Genetic Resources, Vairão, Portugal.

    You can also search for this author in PubMed Google Scholar

From October to January, millions of birds from central and northern Europe winter in the Mediterranean basin. Suction olive harvesting at night kills these legally protected birds on a catastrophic scale as they rest in the bushes. This year, Spain’s Andalusian government recommended that the practice be stopped; currently, an estimated 2.6 million birds are vacuumed up annually in the country (see go.nature.com/2zkomts). Other big olive-producing countries should follow their lead.

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Nature 569, 192 (2019)

doi: https://doi.org/10.1038/d41586-019-01456-4

Updates & Corrections

  • Correction 24 May 2019: An earlier version of this Correspondence incorrectly stated that Spain’s Andalusian government ended night-time suction harvesting of olives this year.

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Stop harvesting olives at night — it kills millions of songbirds (2024)

FAQs

Why do they harvest olives at night? ›

The trees are stripped at night because cool temperatures help to preserve the olives' aromatic compounds.

What time of year do you pick olives? ›

WHEN TO HARVEST OLIVES? In general, olives are harvested between October and January. But it all depends on the time of year when the fruit ripens: from one geographical area to another, the harvest period can be very different, depending on sunshine and exposure conditions.

Are olives harvested every year? ›

Every year, usually in late October, Italians begin the age-old tradition of harvesting olives to make extra virgin olive oil (EVOO), and typically families will harvest their olives to make enough oil to use throughout the year.

How are olives harvested today? ›

By hand with a net, with the help of plastic rakes (pettini) and sometimes long wooden sticks, is probably the most common method. Electric-powered tools for harvesting olives do exist, but the branches and olives can suffer.

Why are olives so important in the Bible? ›

The olive tree's association with royalty and rulership is also shown by its usage in providing “oil” to anoint those favored by God. It was an emblem of sovereignty, and was used to anoint “kings” to office (I Sam. 10:1, I Kings 1:39; II Kings 9:1, 6).

Is it OK to eat olives at night? ›

One can eat olives at any time of the day. However, they are rich in healthy fats. Therefore one can eat them before bedtime if one wishes to have a healthy nighttime snack. In addition, they balance blood sugar, help you feel fuller, and aid in a good night's sleep.

Can you eat olives picked straight from the tree? ›

Olives are harvested both by-hand and mechanically. Harvested olives may be milled to make oil or cured for food production. Olives cannot be consumed direct from the tree; they are too bitter without curing. The raw fruit is bursting with oleuropein, a bitter compound that must be removed prior to eating.

Are olives good to eat right off the tree? ›

There is no such thing as fresh olives, as olives right from the tree are super bitter and inedible. Olives must be cured to eat. These ancient fruits are enjoyed all over the world as simple snacks, elaborate antipasto and cheese board features, as well as gourmet ingredients in everything from pasta salads to pizzas.

Should you pick olives green or black? ›

All olives start green on the tree and turn black as they ripen. The earlier the pick the firmer the olive will be when you eat it. Greener olives will usually have lighter nuttier flavor to black. Some varieties are best picked green, others black.

How many years does it take for olive trees to produce fruit? ›

Olives begin bearing fruit in the tree's fifth year and have full fruit production in seven to eight years after planting. After that they do produce fruit every year. There are varieties among olive trees that are more susceptible to alternate bearing .. one year they have fruits , next year none.

Does the oldest olive tree still produce olives? ›

The Olive tree of Vouves (Greek: Ελιά Βουβών) is an olive tree in the village of Ano Vouves in the municipal unit of Kolymvari in Chania regional unit, Crete, Greece. Probably one of the oldest olive trees in the world, it still produces olives today.

What states grow the most olives? ›

California produces essentially all of the commercial olives in the United States. A decade ago, most US olives were processed as tables olives, the majority canned whole. These are the black olives that we eat on pizza. California table olives are green and inedible when harvested.

Can you eat olives raw? ›

1. Olives are inedible before they are cured. Many people don't know that olives are actually inedible when they are first picked. Raw olives straight from the tree contain oleuropein, an extremely bitter compound that makes olives completely unpalatable.

What culture eats the most olives? ›

However, it is Albania and Syria that lead the way in global table olive consumption per capita, with the two Mediterranean nations consuming 10.8 and 10.1 kilograms per person each year, respectively.

Why don't they sell fresh olives? ›

The main culprit is a bitter compound called oleuropein. And fresh olives contain a ton of it: up to 14% of its dry weight.

Why are olives pressed three times? ›

The first press produces the most pure oil. In Biblical times, this was used to fuel the lamps in the temple, for anointing oil, and for meal offerings. The oil produced during a second pressing was used for medicinal purposes. The third and final press produced oil used for soap.

Do olives go bad overnight? ›

Even once opened, jarred olives will remain fresh for 12 to 18 months, provided they are sealed and stored properly in the fridge. By contrast, olives from the olive bar will only last in the fridge for up to three weeks. Storing olives in brine will help them retain their flavor and prevent quick spoilage.

What happens to olives after they are picked? ›

Harvested olives must be “cured” to remove the bitterness in order to make them palatable. The most common curing processes use brine, dry salt, water, or lye treatments. During these curing processes the water-soluble oleuropein compound is leached out of the olive flesh.

When can you eat olives off the tree? ›

There is no such thing as fresh olives, as olives right from the tree are super bitter and inedible. Olives must be cured to eat. These ancient fruits are enjoyed all over the world as simple snacks, elaborate antipasto and cheese board features, as well as gourmet ingredients in everything from pasta salads to pizzas.

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