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But their ancestors (pictuerd) were very different creatures, with some running around on land like dogs while others adapted to life in the open ocean, imitating the behaviour of whales The team examined variation in the shape and biomechanics function of the lower jaws in over 100 ancient crocodiles during the Mesozoic - a period which began 251 million years ago and covered over 170 million years.
The research also found that variation peaked again in the Cretaceous period- 142 million years ago - where ancient crocodiles evolved a great variety of lower jaw shapes as they adapted to a diverse range of food.
Crocodiles are a close living relatives of birds, but compared to their feathered cousins, they are stuck in the past, scientists claim.
The reptiles evolved at a slow rate after the demise of dinosaurs and their 'body plan' has remained largely unchanged for millions of years, experts claim Dr Richard Green, from the University of California at Santa Cruz, said: ‘The ticking of the molecular clock in the crocodilians is much slower than in other lineages we’re used to looking at, like mammals, which means we can see back into their past more cleanly.
Moving beyond dates, one quarter of online daters (23%) say that they themselves have entered into a marriage or long-term relationship with someone they met through a dating site or app.
Around one in ten online daters (13%) agree with the statement that “people who use online dating sites are desperate,” and 29% agree that online dating “keeps people from settling down because they always have options for people to date.” Familiarity with online dating through usage by friends or family members has increased dramatically since our last survey of online dating in 2005.
Some 42% of Americans know someone who has used online dating, up from 31% in 2005.
And more seriously, 28% of online daters have been contacted by someone through an online dating site or app in a way that made them feel harassed or uncomfortable.
Women are much more likely than men to have experienced uncomfortable contact via online dating sites or apps: some 42% of female online daters have experienced this type of contact at one point or another, compared with 17% of men.
Some 22% of 25-34 year olds and 17% of 35-44 year olds are online daters.