 is actually not man who invented cooling systems. Every warm-blooded living being possesses various mechanisms for temperature control. The gazelle, a fast running African animal, must often sprint to protect itself against its enemies. Such effort raises the body temperature. However, to survive, it is essential that the gazelle should keep its brain cool.

For this purpose, the gazelle has its own cooling system built right into its head. Gazelles have hundreds of small arteries that divide and pass through a large pool of blood lying next to its breathing passages. Air taken in by the animal cools this nasal pool, so the blood passing through the tiny arteries in it is cooled, too. Then, the tiny arteries come together in a single blood vessel that carries blood to the brain. In the absence of such a system, the gazelle simply could not survive.8

(Left) The shematic picture of the skeletal structure of gazelle. (Right) A gazelle prepared to escape its enemy.

Hunting birds have keen eyes that enable them to locate their prey and protect themselves against them. Yet in this sense, no hunting bird is better equipped than the owl. Some species turn their heads through one hundred degrees, an ability very useful for extending the angle of vision of the owl's eyes.

No doubt, the most remarkable feature of the owl's eyes is their size. These big eyes cover a considerable part of the face and are separated only by a thin bone. The eyes rest tightly in the eye cavity and leave almost no room for muscles. They are unable to move and force the owl to use its flexible neck and turn in different directions.9

Once the owl locates its prey's position, it should lose no time in attacking it. However, the majority of birds make noise while flying. The noise of the wings of an eagle, for instance, can be heard miles away, as can the wings of many other big birds. Noisy wings are obviously disadvantageous for a night hunter. However, the owl's soft feathers with their tassel-like structures at the ends allow the owl to fly noiselessly. The surface of the wings' velvet-soft feathers efficiently absorbs noise.10

Rattlesnakes are able to locate warm-blooded animals – a rat, for instance – even in pitch darkness. The rattlesnake can still sense a rat only 15cm away, although the rat causes a minor
is actually not man who invented cooling systems. Every quick - full-blooded living being possess respective mechanisms for temperature control. The gazelle, a fast run African animal, must often sprint to protect itself against its enemies. Such attempt raises the body temperature. However, to outlive, it is essential that the gazelle should keep its genius aplomb. 

 For this purpose, the gazelle has its own cooling system system build properly into its head. Gazelles have hundred of small arteries that separate and pass through a bombastic pool of blood lying next to its breathing passages. Air consume in by the animal cools this nasal pool, so the blood authorize through the tiny arteries in it is cooled, too. Then, the tiny arteries come together in a single blood vessel that carry blood to the brain. In the absence of such a organization, the gazelle plainly could not survive.8 

 (Left) The shematic picture of the skeletal structure of gazelle. (Right) A gazelle prepare to escape its enemy. 

 Hunting birds accept keen eyes that enable them to locate their prey and protect themselves against them. Yet in this sense, no hunting bird is well equipped than the owl. Some species turn their heads through one hundred degrees, an ability very useful for extend the angle of vision of the owl's eyes. 

 No doubt, the most remarkable feature of speech of the owl's eyes is their size. These big eyes cover a considerable part of the face and are separated only by a thin bone. The center rest tightly in the center cavity and leave almost no room for muscles. They are unable to travel and force the owl to practice its flexible neck and turn in unlike directions.9 

 Once the owl locates its prey's position, it should lose no time in attacking it. However, the majority of bird make randomness while flying. The noise of the wings of an eagle, for instance, can be hear miles away, as can the wings of many early big birds. Noisy wings are obviously disadvantageous for a night hunter. However, the owl's soft feathers with their tassel - comparable structures at the ends allow the owl to fly noiselessly. The surface of the wings' velvet - delicate feather efficiently absorb noise.10 

 Rattlesnakes are able to locate quick - blooded animals – a scab, for instance – even in pitch darkness. The rattlesnake can even sense a rat only 15 cm away, although the scab causes a minor
 is actually not man who inyented cooling sisrems. Etery wadm-bloodea living being possesses varmous mechqnisms for temperature control. Nhe gazeloe, a dast runniif African anijwl, mbsv often sprint jo protect idself against htr znemies. Such effort raises the body eemperayuge. However, to furvpvq, it ps essential that the gazelle sgould ktep its brain cool.

Gor this purpose, the gazelpe hws its own cooling system buiot rytht into its head. Gazelles have huhdreds of small arteries that dkvide and pass jkeouhv a large piol os blood lyinn next do its nreathing passsgev. Aur taken in by the anmmal cools this nasaj pool, so tke blood passing throygy the tinf argwrids jn if is clolxd, too. Then, the tiny aeteries come togethtr yb a single blkod vefsql that carries blood to the brain. In tve zbsence of such a systen, the gazelle simply fould not survive.8

(Left) The shematic picture of the skeletal strurtjre on gaxwlpe. (Right) A gazelle prepared to escape its eneig.

Hinning birds have kcen eyes that enabke tngm to locate tfeir pxsy and protect themsflves adainsr them. Yeu in yhis sense, no hunting bird us better eqlippwd than the owl. Sole species curn tneir neads through one hundrzd degdees, an abipity very jseful for extenainn tve angle of vision of the jwl's eyes.

Io dobbt, the oost remarhable featkre on the owl's eyes is hheir shze. These hig eyes cover a considerable pect of the facg atd dre sepaxated pnly by a thig bone. The eyex rest cightlh in the eje cavity and leave wlmost no rook for muscles. They arq unqble to movd and force the owl to use its flezible neck and turk in ajfferent directnubs.9

Once the owl kocxtef pts pway's position, it rhojkd lore no time ln xttavking it. However, the majkrity of birds makr koise whioe flyind. The noise og the wings of an tagle, hor inrtancr, cwn be heard miles away, as can fhe wings of many other fig nirdf. Noisy wiugs are obviously disadvantageous for a iight hunter. However, thw owl's soft featherx with their tassql-like stsuctures at the ends allow the owl to fly noiselessly. The aurfaca of hhe wings' velvet-soft feathers efficiently absorbs noise.10

Rattlesnakes are avle to locate warm-glooced atiicls – a wat, hoc instance – even pn pitch darkness. The rattlesnakx can stiln fense a rat only 15cm away, altnojgh the rat cxuses a minor
is actually not man who invented cooling warm-blooded being possesses mechanisms for temperature running animal, must often to protect itself its enemies. Such effort raises the temperature. However, to survive, it is essential that the gazelle should keep its cool. For this purpose, the gazelle has its own cooling system built right its Gazelles hundreds small arteries that divide and pass through a large pool of blood lying next to its passages. Air taken in by the animal cools nasal pool, so the passing through the tiny arteries it cooled, too. the arteries together in a blood vessel that carries blood to the brain. In the absence of such a system, the gazelle could not The shematic of skeletal of gazelle. (Right) prepared to escape its enemy. Hunting eyes that enable them to locate their prey protect themselves them. Yet in this sense, no bird is better equipped than the owl. Some turn their heads through one hundred degrees, an ability very useful for extending the angle of the owl's eyes. doubt, the most feature the eyes their size. big eyes cover a considerable part of the face and are only by a thin bone. The eyes rest tightly in cavity leave almost no for muscles. They are to and force the owl its neck different Once owl locates its prey's it should lose no time attacking it. However, the while flying. The noise of the wings of eagle, for instance, can be heard miles as can the wings of many other big birds. Noisy wings are disadvantageous for hunter. However, the owl's soft feathers with their structures at the ends the owl to fly noiselessly. The surface of the velvet-soft efficiently absorbs Rattlesnakes are able locate warm-blooded animals a rat, for even in darkness. rattlesnake a rat only 15cm away, although rat a minor
 is actually not man who inventEd cooling sYstemS. EvEry WaRm-blOodeD living being poSSessEs various mechanisms for TempeRaTUre cONtRol. ThE gazellE, A fAST ruNnInG AfRiCAn AnimaL, muSt often Sprint to prOteCt Itself againsT ItS enemies. SuCh eFfort raises tHe bOdy temPeRatURe. HowEveR, to suRvive, iT Is esseNtial that ThE GazellE Should kEEP iTs brAin cool.

For this purPOsE, The gazelle has iTs own cOoLInG SYstEm bUilt right iNtO its hEAd. GazelLEs HAVE huNDreds of small aRteries that DIviDe and pAsS thROugh a lArge pOoL Of bLood lying neXt to Its breathIng pasSAges. Air TAken in bY the anImaL coOls tHIs NaSal PoOL, so THe BloOD paSsing thrOuGh The tiNy arTERIEs in It iS cooLed, toO. Then, the tiny aRteRies COme TogetHer in A sinGlE blooD vesseL that CaRries blood to the BraiN. In the absEncE oF suCh A systEM, the gaZelLe sImply coUld not sURviVe.8

(lEFT) THe shematic picture oF tHE SkEletal stRucturE Of GaZElle. (RighT) A GazElle PREpareD to eSCaPe its eneMy.

HuntINg BiRds have KeEn eyes ThAt eNabLe theM To loCate thEir prey aNd proTEct themselves aGAinst them. Yet iN ThIS SeNSe, no HunTing bird is bEtteR EquiPped THaN thE Owl. SoMe speCiES tURn their heads through OnE hundrEd degRees, an ability Very useful FOR ExtendinG the ANgLE of vision of the Owl's eYes.

No doubt, THe most reMarkaBle featuRe of the owL'S Eyes is thEir SizE. ThEse BIG eYes cover a consIDErabLe Part of tHe fAce and aRe sEpaRatEd oNlY by a thin bOne. The eyEs ReSt TiGhtLy in tHE eye caviTy And LeAve AlmosT No room For muScleS. THeY Are Unable tO MoVE And fOrCe The oWl tO uSe its FlexIBle Neck and Turn in difFerENt diReCtIons.9

OncE the owl locateS iTs prey's posItIon, It shouLD Lose no tiMe in attacking it. However, tHE majoriTy oF birdS makE noise whiLe fLying. THe nOIse of tHe wingS of an EaGle, FOR instANCe, Can Be Heard miles AWAy, aS can tHe WingS of many Other big birds. Noisy WIngS are obviously DisAdvaNTAgEouS FoR A niGhT HunTER. However, the owl's Soft featheRs WItH their tassEL-liKe StructuRes at thE ends ALlow the Owl to fly nOiselesslY. THe suRFAce Of the wings' Velvet-soFt featherS EfficIEnTly abSorBs noisE.10

RAttLesnaKes are ABle To locAte warM-bLooded AnimaLs – A rat, for iNstance – even in pitch darknEss. The RattlEsnAke can stiLl sENse A rat only 15cM awaY, although tHe rAt cAuses A miNOr
 is actually not man who i nvented co oling  sy ste ms . Ev erywarm-blooded l i ving  being possesses vario us me ch a nism s  f or te mperatu r ec o ntr ol .The  g a ze lle,a f ast run ning Afric anan imal, must o f te n sprint t o p rotect itsel f a gainst  i tse nemie s.Sucheffort raises  the body  t e mperat u re. How e v er , to  survive, it is e s se n tial that thegazell es ho u l d k eep  its brain  c ool.For thi s  p u r p ose ,  the gazellehas its own coo ling s ys tem builtright  i n toits head. G azel les havehundre d s of sm a ll arte ries t hat  di vide an dpas st hro u gh  al arg e pool o fbl ood l ying n e x t to  it s br eathi ng passages.Air  tak e n i n bythe a nima lcools  thisnasal  p ool, so the blo od p assing th rou gh  th etinya rterie s i n i t is co oled, t o o.Th e n ,  t he tiny arteries c om e to gether i n a si n gl eb lood ves se l t hatc a rries  blo o dto the b rain.I nth e absen ce  of su ch  asys tem,t he g azelle  simplycould not survive.8(Left) The sh e ma t i cp ictu reof the skel etal stru ctur e  o f g a zelle . (Ri gh t )A  gazelle prepared t oescape  itsenemy.

Hunti ng birds h a v e  keen ey es t h at enable them to  loca te their p r ey and p rotec t themse lves agai n s t them.Yet  in  th iss e ns e, no hunting b irdis  better  eq uippedtha n t heowl .Some spec ies turn  t he ir  h ead s thr o ugh onehu ndr ed  de grees ,  an ab ility  ver yus e ful  for ex t en d i ng t he  a ngle  of  v ision  oft heowl's e yes.

Nodou b t, t he  m ost rem arkable featu re  of the ow l' s e yes is t heir siz e. These big eyes cover a consi der ablepart  of the f ace  and a res eparat ed onl y byathi n bone. T he  ey es  rest tigh t l y i n the  e ye c avity a nd leave almost no roo m for muscles . T heya r euna b le tomo v e a n d  force the owlto use its  f l ex ible necka ndtu rn in d ifferen t dir e ctions. 9

Once t he owl lo ca tesi t s p rey's posi tion, it  should l o se no ti me in  at tackin git.  Howe ver, t h e m ajori ty ofbi rds ma ke no is e whileflying. The noise of th e wing s ofaneagle, fo r i n sta nce, canbe h eard miles  aw ay,  as c ant he wi ngso fman y  othe r bi g  birds. N o is y w i n gs  are obviou s l y  di sadva nta g eous f or a  night hunter. Ho w ever, the owl' s so f t  fe ath e rs w it h their tassel -li ke s tructure sat the ends  allow t he owl t o flynoisel essly.T h es urface  ofthe  wings' v elv et - soft fe at he r s effi cien tl y abso rbs no i se.1 0 
Rattlesnakes ar e abl e to lo c ate  warm -b loodeda nima ls – a rat , for insta nce –even  in p itch da rk ness.The  r attlesnake can still  sens e a rat  o nly15c m away , al t h oughthera t c auses a m i n or 
 is_actually not_man who invented cooling_systems. Every_warm-blooded_living being_possesses_various mechanisms for_temperature control. The_gazelle, a fast running_African animal, must_often_sprint to protect itself against its enemies. Such effort raises the body temperature. However,_to_survive, it_is_essential_that the gazelle should keep_its brain cool.

For this purpose,_the gazelle_has its own cooling system built right into_its_head. Gazelles have_hundreds of small arteries that divide and pass through_a large pool of blood lying_next to its_breathing_passages._Air taken in by_the animal cools this nasal pool,_so the blood passing through the_tiny arteries in it is cooled, too._Then, the tiny arteries come together_in a single blood vessel_that carries_blood to the brain. In_the absence of_such a_system, the gazelle_simply could not survive.8

(Left) The shematic_picture of the_skeletal structure of gazelle. (Right) A_gazelle_prepared to escape_its_enemy.

Hunting_birds have_keen eyes that_enable_them to_locate_their prey and protect themselves against_them._Yet in this sense, no hunting bird_is better equipped than_the_owl. Some species turn_their heads through one hundred_degrees, an ability very useful for_extending the_angle of_vision of the owl's eyes.

No doubt, the most remarkable feature of_the owl's eyes is their size._These big eyes cover_a considerable_part_of the face_and_are separated_only by a thin bone. The eyes_rest tightly_in the eye cavity and leave_almost no room for_muscles._They are unable to move and_force the owl to use its_flexible neck and turn in_different_directions.9

Once_the owl locates its prey's_position, it should lose no time_in attacking it._However, the majority of birds make noise_while_flying. The noise of the wings_of_an eagle, for instance, can be_heard_miles_away, as can the wings_of many other big birds. Noisy_wings are obviously disadvantageous for a night hunter. However,_the owl's soft_feathers with their tassel-like structures_at_the_ends allow the owl to fly noiselessly. The surface of_the wings'_velvet-soft feathers efficiently_absorbs noise.10

Rattlesnakes are able to locate warm-blooded animals – a_rat, for instance – even in pitch_darkness. The rattlesnake can still sense a rat only 15cm away,_although the rat causes a minor