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Sidney , Montana
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April 9, 2003     Sidney Herald
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April 9, 2003
 

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48--Wednesday, April 9, 2003 Serving the MonDak area s,mce 1908 0fW EXPLORING THE REALMS OF HISTORY, SCIENCE, NATURE & TECHNOLOGY What is an egg? All eggs start as tiny cells that, if fertilized, will grow Almost all animals make eggs in order to reproduce. Most mammals keep the egg inside the mother's body until the young are ready to be born. But many creatures -- birds, most reptiles, insects and fish -- lay their eggs. This page focuses mostly on the eggs that animals lay. Kinds of eggs The egg examples below are The ostrich egg can weigh more Chicken egg An egg begins as a cell called an particles form around the ovum the size of a fully formed egg. The yolk tl through a long tube called the way, layers of albumen (protein followed by shell formed in the uterus. It takes more than', for the yolk to move through the oviduct, into an egg ready to be laid. into baby animals. When birds, snakes, turtles and shown at actual size Some -~ ~"~. -.than 3 pounds and is the largest . "t The egg cell or • ~ ~ . . I • ovum is releas~ insects mate, the eggs are fertilized inside the people have made an art ofz _ -~. egg la~d today. Some dmosaur into the oviduct. female. But most toads, frogs and fish fertilize their carving large eggs that J A goose egg "--.. eggs were even bigger. ". _ :. eggs outside the mother. Eggs come in many have very thick shells, ~ can vary a great ~ - - | such as ostrich J/ deal in size. This ~ The humming- | ,' sizes, shapes and colors• Some have hard shells; emu and ' ~ one is about 4 ~ bird egg is the ;... - J~ / others have soft shells. Birds lay just a few eggs goose eggs.~ inches long. I ~ smallest of bird ... ~ ~ each year, while an oyster can produce more than / I I \ eggs and "',.. •'/, /~" / " 500 million eggs in a year. ~ I ~- ---~-1-~ \ weighs about '~_ I ' I \ 0.02 ounces. - 3 Anatomy 10l / ~coating, ~ ~---~L~ ~~ ] ~j~ ,~. The germinal disc, or nucleus, is the part of an / ~!~ " / -- \ \ ˘= The egg is / ,, ~1 a a .!!- t=lW, I i egg that becomes an animaI. The rest of the egg l ~ \ ad. /q4" rm tn ~al serves as food and protection for the embryo. / / I L____˘= Theherd~ Fr e s ~ t 1 ~ • inside the Parts of a chicken egg .. og gg / / coorsdevel0p Yolk Shell membranes are laid in ~ t 1 ,._,~ Germinal disc ~ F- Shell water. ~ ] 1 A newly laid egg must be kept warm (Im~ Vitelline membrane --] [ II- Inner shell membrane ~ 1 if it is going to grow into a chicken. If ttle~ Light layer ~ I I l] Air space ---'-1 ~"- ~: ~:- { tOO cold the chick will die. 17 :: =:_ -_ , a head, a heart and ataiI. The Eggw"'l I I " ~ yolk develops '-~~ Chalaza---J II -- blOOd vessels to ""-~ Thickwhite ---J I ~1~ feed the embryo. ~'~ ~:~ ..--~S Thin white ~ Snapping turtle eggs -- 7 are more-round than {, L___~---~ _- ~~, Day "t oqal and are laid in a \ / -- ~~ A sac What do you know? nest dug into the ground. ~.~ / ~ /~~ ~\ called _. - - -----I- - ,, emb,O. 1 ACROSS T . Day I Day 6 Day 7 Day 21 Day 28 ' and legs 4 Newly laid birds eggs must be -:-~~ .//' Insects ....... ,. • • : • "~...~:~ :~'.~: ~!!:.~.,. " .~. ~(.. ' .-, . "----~-~,~ ~y/" develop. ,kept warm, if they are to hatch Insects lay a lot of eggs. ~~/~:~::ii ~ ~!ii!~, ~ 6 This animal can produce more than 500 million Many of these hatch into~" ~;~ '~'~i,~!: ~j~ / '( ~ ~ .. ~~ eggs in one year larvae (caterpillars or grubs), Lady bugs lay The ec~s change color The larva is born without wings; Day 12 ~~ 7 All eggs start as tiny __ ..................... which h~v~ ~nnth~r .~t~n~....fn .~....~- about 15 to 20 shortly Defore they hatch, after eating• for. about, a week it Pimples where :.. eggs cnanges into a pupa. 9 Long reproduction tube in a chicken development (growing inside ~;; Day 35 Day 36 the feathers will ,,/~(~ a cocoon, pupa or chrysalis) ~?~ ~ The pupa case ::~:::~iii~ ...... ~ Day 37 grow are visible. '~~ DOWN before emerging as an adult• ~ ~ breaks open "X-II~:~ ~ Afterabout 24 hours A beak forms and "~ ~'~" and an adult ~~ ~lWllIl,~ the ladvbua chenaes ........... \~ 1 An egg cetl is also celted this ' ~ ~ adyb g is bom. ~"~ ~'~t, color from yeltow to red. ~~ 2 The first crack or break in a hatching egg . shares the space. - ...... , 3 In just three days of the egg being laid, a chicken "r'~. ~ Day 14 Day 25 Day 28 Day 84 embryo has developed a head, tail and this l-'lSn . ~.=-~.~ About three weeks ....... ~ The ,,oun" trout \ Day 20 • . .... ~ ~ - ,:~ y ~ ~< .\ 5 Another word for the nucleus of an egg Different species of fish have . ~:..;..: .. ~!::!:! ~r~etr, tohr ebaby) / ~~ (p,a~..)~vel..o~ .~,.~ OneK 6 This bird lays the largest egg in the wodd a vanety of ways to lay thelr . :: ': 'L~?~ emerges. "( ~~ '~'°~"°"*'~°" ~~ :~\~\ before • . . will 7 Some people do this as an art form to larger eggs. Most fish eggs are fertil- The rainbow trout can ~ ' ~ ~ ' ~ ~~ '.,, : bird eggs ized. in the water, after, riley, are laYegmOres ayearthan 1,000~wo ~ ~. "~~" \,~"~ '~~-~.~ :7,~/ tootnSpe~" 8 Most toads, frogs and fish fertilize their laid but some species includ- wea~ after ~ey are It takes "~~/? ,_ ~. eggs the mother ing sharks and rays, fertilize laid, little fish bodies two years for ~~~/ utah' the ""s inside the mother, can be seen. ~r~ ~ ~_~ ---- the trout to reach .... -- :-~ -- the cl' Day 21 out I I. I 1 1 I,I ] L:,:;t:: :;:I I:::::1 ,,_ • ,., ............... The first crack or break in the uay ~ uuy ~ u uuy ** . uuy ,~ I 1 1 I I I I I I 1!:31: :I: ::;:::t Fro s ~ " In six to eight she s called a pip The chick~j: •, . - = , ~ ~ weeks the tad- f. I I:1 I I::1 t l:l Amphibians live part of their . :. . ~..~]I" ,~.~.L~.... _~P pol~develop uses all o its stre.ngth to / [1 1 II lit:1 I:~][~:::::;~1::] lives as water animals and ** *" .,,..,~'~ ~ backlags. DreaK out of the snell /~ par[ as lane animals f I I f I //I I I f1.::: ] !rl::il] ..... A frog can lay up to /--,,,',~ "~'L~ °~,~1~ andisbomwet~~ • ~ 1,000 eggs at a time, but only a ~ '~ and tir"~ f ~:~ [::I ]:1 I 1 I I I:::~:~::::~l~'::::;l Frogs, toads, newts ~Jj~ few will manage to survive to adulthood. -,,w~.,~. ou. [~~ [ i [ [ [. I [: 1, I t, [ii :::]amphibians.and salamandersMostareof these%~~~~ Most areDayeaten53bypredators.~' It takes three ~~~: >: i If:/ I It I' I, ] animals lay round, jelly- In the span of ~~ years for a frog I I ]'1 I I I 1 1 coated Some are laid . about a month the ~j to reach fu,l Jill [ I, 1 IIll ===================== ] • tadpole growsfront " maturity and ,. one at a time; others are"/;id "~'~ ~ legs and its tail ~ be able to~~ [I1 I1: i II 1t in stnng clusters. _ beg]nstoshnnk, layeggs. L t I I I i t::1 ] :::1 I I : I: I [ l I ' :l "'" " Dayl Day38 Oey S2 t y6S ...... , ..... ulgator :'-~C ~:" : ......~ ~ ........ alligat"or uU~Ys The chick rests and warms up close to Unlike man re t es. a ators ~'~ - ~ ..... ~ : i~. ...... ~ ..... . • .......... ~..~a sp~al eg.gand with n ~ fmw hn,,r~ t _~ dry nnd Y P g .. • ......... . ........ ................... • ~. / ˘ ~:i:~ • ; ~, TOOITI I0 "I , , break out offluffy yellow down mothers. They carefully dig \._.j - ; . e shell. o nests and re.main nearby,while An alligator may lay The eggs are incubated by the heat " me eggs incuDate• Also, mey 50 to 60 eggs ~n a of the sun and deceyin~ plant ~atter " ~~ SOURCES: Work;/Book Er~, Wodd ,= -* © = = ,- m © ,o often help OUt when it is time fne tw lelar stlO The sex of the babies" depends or~ ~=~'~'~ .... T E : a: nar ' I~ 2003 Tdefeldt Studios Inc ........... ee the temperature of the eggs dunng ,, ( I ' ' ~ 'ng my; Distributed by United Feature Syndicate, Inc. Tor me DaOles TO natcn, feet deep. the first few weeks - ~ I Living Earth, Covent Garden Books Community Involvement. I r; for sponsoring Mrs. Montgomery's class at Central Intermediate :~:i~i~i~ ~i~i: ......• : ~.. can sponsor a For more information contact N.I.E. Coordinator Deniece Schwab. 310 2nd Ave. NE, Sidney * 482-2403 Richland Federal Credit Union provides each student in Mrs. Montgomery Central Intermediate School with a Wedne, edition of e