since bird eggs have to be rolled, why can reptile eggs get by without rolling?
595645
It is my understanding that rolling a bird egg equalizes the heat generated by the nesting mother, while for the reptile, the nest of decaying vegetation provides a pretty equal heating.\n\nThe bits before about the embryo attachment are true- and it would be interesting to researh the differing pathways these species took. Obviously, being able to heat your eggs on your own means you can and must protect them, which seems to logically flow into raising them at least a little. \n\nThis also means your young can be less developed at birth- unable to feed or care for themselves... it all sort of flows together, doesn't it?
853730
The forces are gravity down  and air drag up.\nIf you want your egg to land softly, one way is to increase its coefficient of drag -- give it a parachute.
131428
no they dont lay egg they carry the eggs in a pouch til they are ready to hatch
979341
Roosters don't lay eggs = P
98479
It can't roll anywhere because rooster's can't lay eggs. If u meant rooster instead of roster.
1140709
reptiles normally dont live in cold areas due to that they are cold blooded.  this means that they need heat to raise their body temp. so they can begin to move, eat, reproduce, etc.  that is why u normally see them sunning themselves.\nfrogs lay alot of eggs due to the amount of predation over the eggs.  the more eggs laid the greater chance of a few to grow to adult frogs.  frogs are not the only animal to lay a large amt of eggs.  this also goes to other toads, reptiles, fish and insects.
473099
my guess is that the egg did, since the animal that laid the egg was lower on the evolutionary scale.If you read new articles, we are constantly coming up with new creature fossils that  try to prove whether or not (or when) sea animals crawled on land or learned to fly.\nI believe the egg was the freakish change that eventually became whatever animal comes from the eggshell, be it snake or bird.
474939
Depends on the bird. Usually it is inversly proportional to the size of the cache of eggs. Chickens for example lay a great number of eggs because they are flightless and pretty much defenseless. Mortality is high so the species compensates with prodicious egg laying. Interestingly this makes them an excellent livestock choice which has certainly contributed to the survival of the species.
604070
You need to get the sperm to the eggs and with an "army " of sperm, its more likely that some of it will eventually make it past all of the factors that might cause it from not reaching its target... such as when pollen is on a pollinator, some of it is usually lost in flight or just in the regualr movement of the animal that does that job. some plants are pollinated by the wind and the more that is released increases the  chance that some of it will reach the egg. Eggs are usually very close to the adult version of the plant or even within the plant before they are fertalized so they are mainly stationary... with more chances to reach the egg it increases the fecundity.
1186677
1. amphibians don't have AMNIOTE land egg. Reptiles do.Thus amphibians lay LOTS of eggs which have HIGH mortality rates from fungus, other organisms eating them; reptiles eggs are less vulnerable to mortality and so they lay fewer and have higher rate of hatching\n2. amphibians mate with external fertilization. Reptiles have internal fertilization and mate with HEMIPENES, not penis (true penis is in mammals!)\n3. slimy skin in amphibians, so they need water env, vs reptiles have heat-dessication resistant scales\n4. Most nitrogenous wastes of amphibians are ammonia\nreptiles have very concentrated uric acid\n5. amphibians and most reptiles have 3 chambered heart, but CROCODILIANS have a partial septum in their ventricle\n6. metamorphosis in amphibians, dev in egg in reptiles\n7. reptilian skull much more solid-heavy than amphibians.  There are more bones in reptiles (radio-ulna is ONE bone in frog, tibio-fibula is ONE bone in frog.  Reptiles have the same lower leg-arm bones as us humans and are NOT fused as in amphibians. Amphibians lack ribs, reptiles with ribs.\n8. ear HOLE and external ear on reptile head. Amphibians just have the tympanic membrane there,so they don't have much of an external ear.
517841
The egg.  Dinosaurs were laying eggs far before chickens had evolved, so the egg had to've come first.  :)
1063260
In most birds and reptiles, an egg (Latin ovum) is the zygote, resulting from fertilization of the ovum. It nourishes and protects the embryo. Oviparous animals are animals that lay eggs, with little or no other development within the mother. This is the reproductive way of many fish, amphibians and reptiles, all birds, the monotremes, and most insects and arachnids.\n\nSince there are well over 800,000 species of insects I'd say oviparity is the way the largest number of animal species reproduce.
763147
part of the trick is to have the egg land vertically because it less likely to crack at the ends; if this is not possible, try to stick with conatined (like a box) soft items, such as cloth, rubber, styrofoam (anything plyable) on top w/ support
270
1.  Dinosaurs laid eggs millions of years ago.\n2.  Chickens weren't around millions of years ago.\n3.  Therefore, eggs came first.\n4.  Later, egg-laying birds evolved into chickens.
1100007
THE MAIN DIFFERENCE IS THAT AMPHIBIANS ARE DEPENDANT ON WATER. So obviously, adaptation will be based on this difference...\n\nMost reptiles are not as dependent upon nearby water as amphibians. Reptiles have solved the drying-out process by having the skin covered with hard, overlapping scales which help to keep moisture from excaping the body. Reptile eggs do not need to be laid in water because, unlike amphibain eggs, they have a tough shell which helps conserve moisture. Some reptiles may even retain eggs inside the body until they hatch, then giving birth to live young.\n\nreptiles have claws on their feet to help climb, run and dig on land. Because most reptiles are not dependent upon a body of water for reproduction, they can live in places such as deserts where it would difficult for amphibians to survive. Some reptiles, such as crocodilians, many turtles, some snakes and a few lizards have gone back to living in the water, but they breathe air through their lungs and must still emerge from the water to lay their eggs on land
194656
Reptiles dont have the ability to move jaws laterally, so they cant chew the way mammals can.
983124
4)  The sheet absorbs the energy of the egg in motion.  The basic principle of action/reaction can be applied here.  The egg does not break because the accelleration is different.  When it hits the wall it decellerates quickly and the energy is put into the shattering of the egg.  When it hits the sheet the energy is absorbed by the motion of the material.