Since 1500, over 320 terrestrial vertebrates have gone extinct and the remaining species have experienced a 25 percent decrease in abundance. Invertebrate animal life is also facing a dire situation. The current decline is attributed to human activity, leading to what researchers call an era of 'Anthropocene defaunation.' Between 16 to 33 percent of vertebrate species are globally threatened or endangered, with large animals like elephants, rhinoceroses, and polar bears facing the highest decline rate. This decline in large animals leads to an increase in rodents and disease-carrying ectoparasites. In the past 35 years, human population has doubled while the number of invertebrate animals has decreased by 45 percent due to loss of habitat and global climate disruption. These trends could have negative impacts on our everyday lives. Dirzo recommended that promptly reducing habitat change and overexploitation would be beneficial, but these strategies should be customized to specific regions and circumstances. He emphasized that extinction is not just about the disappearance of a species, but also the loss of essential ecosystem functions that animals contribute to. This information was detailed in a review published in the journal Science.