It also says that nearly 301 mammal species are at the risk of getting extinct due to being hunted for food.
And as an added warning to the WWF report on Monday, a new study published in the journal PNAS, led by S. Blair Hedges at the Center for Biodiversity at Temple University in the US, found that less than one percent of the primary forest in Haiti remains, and that many endemic species, especially amphibians and reptiles, have been wiped out with the trees.
WWF is calling for a new global deal for nature - a set of collective actions together with a roadmap for targets, indicators and metrics for reversing nature loss including scenarios for land-use change, dietary shifts, sustainable harvesting as well as traditional conservation approaches such as protected areas.
The top threats to species identified in the report are directly linked to human activities including habitat loss and degradation and overexploitation of wildlife.
The report says freshwater species, of particular concern for Great Lakes fisheries, are down 81 per cent.
Just as the WWF report was released China has announced a decision to partially reverse a ban on the trade of tiger bones and rhino horn. South and Central America are among the worst-hit areas, with animal species declining by 89 percent over the last five decades and freshwater species by 83 percent. And the number of polar bears is expected to decline by 30 percent by 2050 as global warming causes Arctic ice to melt, making their habitats increasingly precarious.
Since 1998 the Living Planet Report, a science-based assessment of the health of our planet, has been tracking the state of global biodiversity.
Over the period of many years, there is an evident proof of extinction of many wildlife creatures. The increased demand for energy, land and water over the past 50 years has also increased our global ecological footprint (one measure of our consumption of natural resources) by over 190%. Barrett said we need a new global deal for people and the environment, and this is our last chance to do this right. "Natural systems essential to our survival - forests, oceans, and rivers - remain in decline", he said.
Current action to protect nature fails to match the scale of the threat facing the planet, the conservationists claim.
"The nature conservation agenda is not only about securing the future of tigers, pandas, whales, and all the unbelievable diversity of life we love and cherish on Earth", according to WWF International's Lambertini.
The world's nations are working towards a crunch meeting of the UN's Convention on Biological Diversity in 2020, when new commitments for the protection of nature will be made.