10 most difficult animals riddlesAnimals quiz
For what main reason do chameleons change color?
to match their surroundings
as a social signal to other chameleons
their skin change color when pressed
chameleons do not change color
Colour change in chameleons has various functions, depending on the species, but the most common is social signalling. Only a few species, such as Smith's dwarf chameleon, also adjust their colours for camouflage
Which animals are the most threatened by a prion disease?
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.
Aside from cattle, which animal provides most milk used by humans?
Water buffaloes provide 11% of the world's milk, which is much more than goats (2%, third place). Buffalo's milk contains higher levels of total solids, crude protein, fat than cow milk; it gives therefore more cheese, butter and other dairy products. The top buffalo milk producers are India and Pakistan.
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. Beaver has the highest ratio of brain mass to body weight among rodents, which is reflected in the behaviour and the ability to act not only instinctively, but also logically.
Which turtles are the biggest?
aldabra giant tortoise
The leatherback sea turtle, the only extant member of the family Dermochelyidae, is the largest of all living turtles and is the fourth largest modern reptile behind three crocodilians. In the Caribbean, the mean size of adults was reported at 384 kg (850 lb) in weight. The largest ever found weighed 916 kilograms (2,020 lb).
What is the main feeding behaviour of hyenas?
none of the above
Hyenas have long been regarded as being cowardly scavengers. Today they are known for killing as many as 95% of the animals they eat, and for driving off leopards or lionesses from their kills.
Which mammal has more than seven cervical vertebrae (neck bones)?
Almost all mammals have seven neck bones, including giraffes with long necks and whales with short necks. The few exceptions include manatees and two-toed sloths, which each have only six cervical vertebrae, and three-toed sloths with nine cervical vertebrae
What is the color of eyes of owls that hunt at night?
it doesn't matter, all owls hunt at night
Owl's eye colour depends on the time of day in which they hunt. The ones that hunt during daylight have yellow eyes. The ones that hunt at night but also at the evenings and mornings have orange eyes. Black eyes are typical to owls that hunt only at night.
In what period did the largest known animal ever live?
At 190 tonnes in weight, blue whale is the largest known animal ever to have existed. The tallest and heaviest sauropod known from a complete skeleton weighed 23–37 tonnes. There were much larger sauropods, but they are known from only a few bones, and it is unlikely they matched a blue whale.