(redirected from warning signal)
Also found in: Dictionary, Thesaurus, Wikipedia.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



(also warning coloration and form), one of the types of protective coloration and form in animals. Aposematic coloration, which contrasts with the animal’s background, is demonstrated suddenly in response to danger and is usually combined with a threatening pose and sounds.

The back wings of certain moths of the family Sphingidae and the genus Noctuidae, as well as cicadas, locusts, and mantises, have eyelike spots or bright bands. Normally these insects are not noticeable, owing to cryptic coloration. When an enemy approaches, however, they open their back wings and unexpectedly reveal their bright coloring, which frightens off the predator. Caterpillars of the family Sphingidae assume a threatening pose, raising the front portion of the body slightly and inflating the thorax, on which eyelike spots protrude in some species. Octopuses, agamas, and chameleons assume a threatening pose and acquire vivid coloration; many reptiles also hiss. The death’s-head moth emits a sharp squeak by releasing air from its foregut.

Aposematism protects animals from predators and gives them an advantage in the struggle for life.


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Indeed, they have been regularly reporting what they have been doing even before public storm warning signals were raised in their areas," the OCD chief.
Forecast position: 24 Hour(Tomorrow morning): In the vicinity of Pentildeablanca, Cagayan(17.6degN, 122.2degE) 48 Hour(Sunday morning):430 km West Northwest of Laoag City, Ilocos Norte (OUTSIDE PAR)(19.3degN, 116.7degE) 72 Hour(Monday morning): 1,205 km West of Basco, Batanes (OUTSIDE PAR)(21.2degN, 110.4degE) 96 Hour(Tuesday morning):1,800 km West of Basco, Batanes (OUTSIDE PAR)(21.8degN, 104.7degE) September 14, 2018 - 8:05am PAGASA has raised Tropical Cyclone Warning Signal No.
At least 24 areas in Luzon including Metro Manila are still under public storm warning signals as typhoon "Lando" slightly weakens as it continues its slow movement towards the provinces of Apayao, Ilocos Norte and Abra, the state weather bureau said on Monday.
Tropical cyclone warning signals have been raised in the following areas: Signal No.
'The postponement is in consideration of the latest forecast of PAGASA-DOST on typhoon Ompong and its expected impact especially to Baguio where Tropical Cyclone Warning Signal No.
Public Storm Warning Signal 04 (171-220 kph Expected in 12hrs.)
Al Francis Bichara has issued an advisory suspending classes in public and private schools from preschool to high school on Thursday (until lifted) as the Philippine Atmospheric, Geophysical, and Astronomical Services Administration might raise typhoon warning signal number 1 on Wednesday night or Thursday morning in the province.
PANGASINAN As Typhoon Lando will gain strength as it comes near Northern Luzon and Pangasinan under Storm Warning Signal No.
Tropical Cyclone Warning Signal 1 has been lifted over Northern Cagayan as tropical depression 'Josie' moved northeast toward the Philippine Sea early Sunday, the weather bureau said.
The province of Batanes is still under public storm warning signal (PSWS) no.