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Descent with modification
-As crocodiles slowly moved to land and changed their diets they developed new traits which were passed down from parent to offspring. The new traits slowly pushed alligators and crocodiles towards and land and out of the water.
stabilizing natural selection
-This is the type of natural selection because order crocodile as a taxonomic group evolved together. They change drastically from there ancient ancestors but didnt change much from each other.
https://www.throughtco.com/crocodiles-the-ancient-cousins-of-dinosaurs-1093747

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-The type of specification is gradual equilibrium. Organisms in this group have gone from fish and underwater animals to land animals and amphibians. This changed happened over the course of millions of years.
-The type of evolution is divergent evolution because all the species came from a common ancestor and changed into their own species.
-Random mating has contributed to the evolutionary track of this taxonomic group because the ancient alligators were aquatic animals mating with amphibious animals.
-Adaptive radiation has contributed to the evolutionary track of this taxonomic group because there was less of a food supply in the ocean which forced my group to evolve into amphibious animals.

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-The number of chromosomes ranges between 30 and 42. This number is constant between all organisms in this group. This shows that all members of this group have a common ancesto.r -https://www.karger.com/Article/Abstract/130080

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As you can see in the photo above , The embryo is starting to grow a tail, a snout, and a long body. Theses similarities are common for all organisms in my taxonomic group

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http://evolution.berkeley.edu/evolibrary/images/news/tiktaalik_reconstruction.jpg

https://matthew2262.files.wordpress.com/2011/02/living-61.jpg

http://www.angelfire.com/mi/dinosaurs/images/casts/crocodile_skull_cast_narrow_snout.jpg

http://l7.alamy.com/zooms/f4870105429744c9955f3a7579698107/fossil-crocodile-reptile-sauria-d1m071.jpg

http://upload.wikimedia.org/wikipedia/commons/a/a5/Alligator_prenasalis.JPG

http://thumbs1.ebaystatic.com/d/l225/m/mLaxy2DnaKd42FJAeIYmhdA.jpg

https://tse1.mm.bing.net/th?id=OIP.GzhbtupC6LueVCIonUjTVACgCg&pid=15.1

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-All species hunt and live alone
-All species live in lakes and swampy areas
-no species have natural predators
-All species have a similar mating calls(roar and slap tails and jaw on ground

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The top 2 fossils on the left show the log narrow snout and the exposed teeth that is very similar to gharial. The short front legs compare to today's alligators. The long back legs were most likely webbed and used to swim. The bottom 2 fossils and the 2 fossils on the right show a wide skull and body that relates to todays alligators

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https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcQEImTXAiati14wojhWc61NiHxDfrZj16vgRRJHnC9vG8e1m9ZT5g

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https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcRAmcgYnu_OTpFGceYPLj6x0hZTcu8wh06sewrGrsH0Rvh-eIcr

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https://www.itsnature.org/wp-content/uploads/2008/08/mugger-crock.jpg

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-diurnal
-hunt alone during the day
- Hunts all prey underwater
-move fast and easily through water
- Males with large sex organs mate
-females lay 30-40 eggs in holes dug on land
http://www.arkive.org/gharial/gavialis-gangeticus/image-G114530.html

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- found in India, Pakistan, Nepal, Bangladesh, Bhutan, and Myanmar
-lives in deep fast flowing rivers

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-diurnal
-hunt alone during the day
-use feet to swim
-dig traps underwater
-fully grown alligators are capable to hunt all freshwater fish
-children hunt insects and small animals on there own
-to attract mates the alligators roar and slap there heads on the water in spring
-female lay between 25-60 eggs
http://www.arkive.org/american-alligator/alligator-mississippiensis/

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-found in south east United States, and North east Mexico
-lives in fresh water swamps, marshes, lakes, rivers, canals, ponds, and can tolerate saltwater bodies for short periods of time

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-diurnal
-hunt alone during the day
-uses tail to swim
-communicates using visual and verbal signals
-males raise tails and snouts to establish territories
-female enter territory to mate: lay 10-20 eggs
http://www.arkive.org/mugger/crocodylus-palustris/

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-found in India, Nepal, Pakistan, Iran, and Sri Lanka
-live in freshwater lakes, rivers, swamps, and marshes.(shallow, calm waters)

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saltwater crocodile
mugger crocodile
America crocodile
nile crocodile
freshwate crocodile
dwarf crocodile
caiman crocodile
gavialidae Gharial
Chinese alligator
American alligator

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Characteristics Common to Gharial Gavialidae (gangeticus)

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Characteristics Common to Gharial Gavialidae (gangeticus)

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-very narrow and long snout
-week legs(cannot hold itself above the ground)
-all teeth exposed
-small compared to other species

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-rounded snout
-no teeth showing
-adults are olive brown or black
- children are yellow
- 70-80 teeth
-thick skin

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Characteristics Common to Mugger Crocodile       (palustris)

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Characteristics Common to Mugger Crocodile       (palustris)

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-wide snout
-4th visible tooth
-flat head with eyes, nose, and ears on top
-children are light tan
-mid-aged are black
-adults are light grey

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Characteristics common to order Crocodilia 

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Characteristics common to order Crocodilia 

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-Elongated skull
-powerful jaw muscles
-teeth set in tooth sockets
-complete secondary plate
-long tail
-short legs
-cold blooded
-webbed feet