Researchers have found out that the size of an animal is important when it comes to extinction. Scientists have determined that the biggest and the smallest animals are more (1) ________ risk of dying out than medium-sized animals.
Heavy animals are mostly endangered by hunting and poaching while the smallest creatures may die out (2)_______their living area is being polluted. Among the most endangered animals are elephants, lions and rhinos. Public awareness is large and campaigns to save such animals have been around for a long time. It is the smallest (3) __________ that get the least attention. Especially fish and frogs are in danger of dying out.
The species that are most at risk have a weight of over 1 kilogram. They are in danger of being (4)__________ because we need food, skin and other items.
According to the study, animals that are (5) __________ extinct affect large ecosystems, like forests, deserts and oceans.
