10 most difficult nature riddles A list of ten (out of 325) nature related questions that are the most often answered incorrectly Nature quiz For what main reason do chameleons change color? As a social signal to othe chameleons. Color change in chameleons has various functions, depending on the species, but the most common is social signaling. Only few species, such as Smith's dwarf chameleon, also adjust their colors for camouflage. very hard 20% to match their surroundingsto match their surroundings51%as a social signal to othe chameleonsas a social signal to othe chameleons20%their skin change color when pressedtheir skin change color when pressed5%chameleons do not change colorchameleons do not change color22%Created by: globalquiz.org. Statistics based on 8449 answers in 5 languages »reptiles riddles » Which species of cannabis contains the most THC?Cannabis Sativa. Some studies indicate that, on average, Cannabis sativa has higher levels of CBD compared to THC than C. indica. The effects of sativa are well known for its cerebral high, while indica is well known for its sedative effects which some prefer for night time use. Both types are used as medical cannabis.very hard 20% Cannabis Indica Cannabis Indica 53%Cannabis SativaCannabis Sativa20%Cannabis RuderalisCannabis Ruderalis10%Cannabis KushCannabis Kush15%Created by: Tschuka. Statistics based on 1902 answers in 3 languages »drugs riddles » Which rodent has the highest ratio of brain mass to body mass?Beaver a large semiaquatic broad-tailed rodent that is native to North America and northern Eurasia. It is noted for its habit of gnawing through tree trunks to fell the trees in order to feed on the bark and build dams. The beaver has the highest ratio of brain mass to body weight among rodents, which is reflected in the behavior and the ability to act not only instinctively, but also logically. very hard 20% ratrat61%beaverbeaver20%squirrelsquirrel8%mousemouse10%Created by: Tschuka. Statistics based on 297 answers in 2 languages »rodents riddles » What pig breed is that?Red river hog. The red river hog is a wild member of the pig family living in African forests. It has striking orange to reddish-brown fur, with black legs and a tufted white stripe along the spine. Unlike other species of pig native to tropical Africa, the entire body is covered in hair, with no bare skin visible.very hard 20% bushpigbushpig34%pygmy hogpygmy hog14%red river hogred river hog20%deer-pigdeer-pig29%Created by: Ninjai. Statistics based on 581 answers in 3 languages »animals riddles » Which animals are the most threatened by a prion disease?Sheep. Scrapie is infectious and incurable. Recent studies suggest prions may be spread through urine and persist in the environment for decades. Scrapie occurs in Europe and North America, but to date, Australia and New Zealand (both major sheep-producing countries) are scrapie-free.very hard 21% cattlecattle33%catscats39%sheepsheep21%ducksducks5%Created by: ex-terminator. Statistics based on 6199 answers in 3 languages »diseases riddles » How much of Australia coastline is desert? (out of total 21,262 miles/34,218 km)140 miles (225 km). More than 40% of Australia's land is classified as desert, but almost all of it is located inland. The Great Sandy Desert is the only one to extend to the coast, forming the long sweep of the Eighty Miles Beach (which is actually 140 miles long).very hard 21% 140 miles (225 km)140 miles (225 km)21%1,000 miles (1,600 km)1,000 miles (1,600 km)14%3,000 miles (4,800 km)3,000 miles (4,800 km)24%14,000 miles (22,500 km)14,000 miles (22,500 km)40%Created by: Cleo. Statistics based on 5092 answers in 2 languages »geography of Australia riddles » That's the skeleton of the largest known ground sloth. What was its size?6 m long and 4 t of weight. Megatherium is one of the largest land mammals known to have existed, weighing up to 4 tonnes and measuring up to 6 m in length from head to tail. It is the largest known ground sloth, as big as modern elephants, and would have only been exceeded in its time by a few species of mammoth.very hard 21% 2 m long and 300 kg of weight2 m long and 300 kg of weight15%3 m long and 1.5 t of weight3 m long and 1.5 t of weight31%4 m long and 3 t of weight4 m long and 3 t of weight31%6 m long and 4 t of weight6 m long and 4 t of weight21%Created by: Ninjai. Statistics based on 144 answers in 2 languages »prehistory riddles » What tree is considered to be the most dangerous in the world?Manchineel. The manchineel tree is native to tropical southern North America and northern South America. All parts of the tree contain strong toxins and even the merest contact with human skin causes a breakout of blisters, and blindness can occur if it touches a person's eyes. In some parts of its range, many trees carry a warning sign, while others are marked with a red "X" on the trunk to indicate danger.very hard 21% oleanderoleander13%manchineelmanchineel21%ricinusricinus26%dieffenbachiadieffenbachia39%Created by: Ninjai. Statistics based on 69 answers in 3 languages »trees riddles » Which of these countries has the highest level of afforestation?Japanese inu. Among developed countries, Japan has one of the highest levels of afforestation, over 68% of the area - beign surpassed only by Sweden and Finland.very hard 23% RussiaRussia45%NorwayNorway14%BrazilBrazil17%Japanese inuJapanese inu23%Created by: Tschuka. Statistics based on 417 answers in 2 languages »Japan riddles » What mushroom is it?Shaggy parasol. The shaggy parasol is popularly praised as a choice edible mushroom. However, it contains toxins which can cause gastric upsets when eaten raw or undercooked, and some individuals show a strong allergic response even after cooking.very hard 23% parasol mushroomsparasol mushrooms53%Shaggy parasolShaggy parasol23%Browned mushroomsBrowned mushrooms11%Toadstool rusty brownToadstool rusty brown12%Created by: Tschuka. Statistics based on 669 answers in 2 languages »food riddles » Play nature quiz and see all the questions.