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''Scarabaeus satyrus'' is one of the
Old World
The "Old World" is a term for Afro-Eurasia that originated in Europe , after Europeans became aware of the existence of the Americas. It is used to contrast the continents of Africa, Europe, and Asia, which were previously thought of by the ...
dung beetle species. These beetles roll a ball of dung for some distance from where it was deposited, and bury it, excavating an underground chamber to house it. An egg is then laid in the ball, the growing larva feeding on the dung, pupating, and eventually emerging as an adult.
Navigation
In a study by
Marie Dacke published in the journal ''
Current Biology
''Current Biology'' is a biweekly peer-reviewed scientific journal that covers all areas of biology, especially molecular biology, cell biology, genetics, neurobiology, ecology, and evolutionary biology. The journal includes research articles, var ...
'', it is reported that researchers have found that beetles of this species use the bright glow from the
Milky Way
The Milky Way is the galaxy that includes our Solar System, with the name describing the galaxy's appearance from Earth: a hazy band of light seen in the night sky formed from stars that cannot be individually distinguished by the naked eye ...
to navigate during night-time operations. Vertebrates such as humans, birds and seals are known to navigate in this way, but this could be the first insect found to do the same. Previous experiments showed that these beetles are able to steer by light from the Sun, the Moon, and polarised light emanating from these light sources. It was their ability to stay on course on clear moonless nights that puzzled researchers. Beetles were taken into the
Johannesburg Planetarium The Johannesburg Planetarium seen from Yale Road
The Johannesburg Planetarium is a planetarium owned by the University of the Witwatersrand, located on the University's East Campus in Braamfontein, Johannesburg. It was the first full-sized planeta ...
where the appearance of the apparent sky could be controlled. To ensure that they were not using cues on the horizon, they were placed in a container with blackened walls. The beetles navigated best when exposed to a clear starry sky, but managed equally well when only the diffuse band of the Milky Way Galaxy was visible. It is undoubted that many other animals make use of similar techniques, some frogs, bats, moths and spiders being likely candidates.
References
{{Taxonbar, from=Q7430246
Scarabaeinae