In August, nature photographer Matthew Nichols posted a surprising photo on social media platforms .
The photograph shows this magical sight inside an ice cave in Nielshan National Park, Washington State, USA, shining in colorful colors.
Matthew Nichols posted a photo with the caption: "When the sun hits the outside of these ice caves on Mount Rainier, they become rainbow ice caves." I went to Mount Rainier specifically to explore the ice caves, and I didn't expect them to be so colorful. ”
While they may seem so fantastical, the U.S. National Park Service recently issued a press release warning visitors not to approach or enter ice caves or meltwater channels. Because these ice caves are prone to spontaneous collapse due to melting, they are very unstable. Ice cave collapses, crushed ice and falling rocks can all be fatal and can cause serious harm to people entering or approaching the entrance.
It is reported that the reason why such a rainbow-like landscape appears in the ice cave is caused by the long algae on the snow and the refraction of light, which varies according to the thickness of the ice layer and the impurities contained.
That is to say, this phenomenon actually needs to be possible at the right time and place.
There is an animal in the ocean, but it is born with a rainbow of colors, and its body color is brilliant, which is called "the flower peacock in the tropical fish".
Peacock fish are colorful in color, distributed in the lower reaches of rivers and lakes and ditches in some tropical areas, and their wild habitats are generally freshwater basins and lakes.
Native to Venezuela and Guyana in South America, it has been introduced around the world as an ornamental fish.
Peacock fish show different colors according to different species, and some are shaped like letters, called "foreign language peacocks"; Some resemble snake stripes, called "snakeskin peacocks"; Some are shaped like leopard skins, called "leopard tail peacocks"... Hybridization of peacock species produces offspring of new colors, making it difficult to find two peacock fish that are identical.
Peacock fish have a very gentle personality, are not aggressive, and can be polycultured with mild small and medium-sized tropical fish, but for the sake of peacock fish's life safety, do not polyculture with large ornamental fish.
Peacock fish is lively and active, the life expectancy is relatively short, generally only 2-3 years, when it really responds to the phrase "born like a summer flower", we do not mention whether its life is wonderful, just its peacock-like body color is enough to be brilliant.
In our innate understanding of sex, male animals are generally stronger than female animals, which is the difference caused by genes. In the case of the peacock fish, it is the opposite.
In general, the body of the peacock fish is slightly larger than the male, the body length is about 7 cm, the color of the dorsal fin and tail fin is slightly darker than the male, most of which is a single silver gray, although there is also a pattern but not as bright as the male.
The male fish is slightly smaller, with a body length of only 4-5 cm, which is more colorful than the female fish, and can bear the nickname of "flower peacock".
Figure | Upper mother and lower male
As an ornamental fish, peacock fish involves the fundamental problem of fish farming - whether it is good or not.
Peacock fish with super adaptability, into thousands of households. It is hardly picky about the water environment, still lives well in aquariums without temperature-regulating inflatable equipment, and can withstand low temperatures of 16 °C and dirty water. Of course, its favorite is the water temperature of 22-24 ° C.
Peacock fish feed on plankton and mainly eat insects and detritus.
It can be said that it is neither picky about the residence nor picky about eating, and it is definitely a well-behaved good fish.
Such a beautiful peacock fish, would you want to raise it?