Why are tigers orange?

2022-07-05 0 By

“Why are tigers Orange?” live Science posted on January 30.”By ASHLEY Hammer.Why are tigers orange?It has to do with how their prey sees them.Animals’ colours and patterns have many different uses — to help them stand out from their mates, for example, or even to warn predators that they are poisonous.But for ambush hunters like tigers, the ability to remain invisible to their prey can make the difference between catching a meal and starving.So, with so many colors, why is a tiger orange?It’s a good question, because to humans, orange is used for objects that need to stand out — like traffic cones and safety vests.From our point of view, the orange color stands out in most environments, making tigers relatively easy to spot.But that’s because we have what’s called trichromatic vision.When light from outside enters the eye, it is projected onto the retina.The retina processes light using two types of photoreceptor cells: rods and cones.Rod cells can only distinguish light and dark, they are not involved in color perception, and they are mostly active in low light.The cones are responsible for color perception, and most people have three types of cones that are responsible for red, green and blue light.This is why our vision is called trichromatic vision: we can see the three primary colors and their rich color combinations.We share this visual style with apes and some monkeys.But most land mammals — including dogs, cats, horses and deer — have dichromatic vision.This means that their retinas have only two types of cones: blue and green.People who get information only from blue and green cones are considered color-blind, unable to distinguish between red and green.The same may be true of dichromatic animals.Land mammals like deer are tigers’ main prey, and their dichromatic vision means predators don’t look orange to them — they see green.This makes tigers harder to spot when they lurk in bushes or crouch in the grass.While green tigers may be harder to spot, especially by trichromists like us, evolution did not produce the ingredients needed for green fur.”Brown and orange are actually easier to produce than green because of the biomolecular structure of animals,” said John Fennell, lecturer in animal recognition at Bristol Veterinary College in the UKIn fact, the only recognizable green (mammal) is the sloth, and its fur is not actually green.It’s actually a type of algae that grows in sloth fur.And as far as I know, there aren’t any animals with green fur.”Fennell has used artificial intelligence to determine the ideal colors and patterns for hiding in a variety of environments.His research was presented on BBC Television 1’s Animals with Bad Behaviour programme.”We asked our hosts to do some kind of simple experiment to show how effective this particular disguise is if you are dichroistic,” Fennell told reportersShe wore dichromatic mirrors, which made her color blind.We compared her with glasses and without glasses in a three-color image — so a normal color image — and tried to find the tiger.”It took longer to find the tiger when the host was wearing a dichromatic mirror.But given that evolution tends to favor traits that help species survive, why haven’t prey animals evolved the ability to see orange?”You can imagine an evolutionary arms race in which improved visual perception leads first to a better visual system,” Fennell said.But there seems to be no evolutionary pressure to become trichromatic, especially for deer, the tiger’s main prey.This could be because the tiger doesn’t know it’s orange either, or because it’s dichromatic.””So there really isn’t an evolutionary arms race for this color,” Fennell said.It’s just that tigers have evolved a coloured camouflage system that protects them well in their jungle environment.”Source: Reference Information Network