Sentences with phrase «callidryas egg clutches»

Karen M. Warkentin of Boston University and the Smithsonian Tropical Research Institute in Panama studied egg clutches located on the edge of Ocelot Pond in Panama to identify the circumstances under which embryos leave their clutch (the gelatinous mass deposited on a tree leaf) prematurely.

The duo attached accelerometers to egg clutches and recorded the vibrations when the eggs were attacked by snakes or pounded by rainstorms.

They discovered that the frog eggs were picking up on the pattern of vibrations over time; rain and wind batter the egg clutches more or less continuously, but snakes have to take a break to chew.

They collected Agalychnis callidryas egg clutches, still on their leaves, from Panama and exposed them to either vibrations at frequencies lower than 100 hertz, which are typical of snake attacks, or rain - like...

While crunching his data in the mid-1980s, Congdon made a startling discovery: The oldest female Blanding «sTurtles — more than 50 years old — had more egg clutches than youngerones, as well as more eggs per clutch.

In his decades of research at the E.S. George Reserve, Congdon found that the oldest female Blanding's turtles he captured had more egg clutches than the younger ones, as well as more eggs per clutch.

Other females may also choose to mate with the male frog and deposit egg clutches in the bamboo.

The temperature difference between summer and winter plays a significant role in the egg clutch size of birds

We discovered that nucleosomes are arranged into discrete groups, which we called «nucleosome clutches» (as an analogy with egg clutches).

Not exact matches

Like covering the clutch of eggs with feathers to protect them while she takes one of her brief breaks.And the «brood patch» of down that she plucked from her own belly to keep the eggs warmer (through direct contact with her skin).

They nest high in the canopy with a clutch size of one or two eggs.

Ease tender gums with this chicken and egg - themed clutching toy!

The researchers compared egg shape with lots of data about each bird species, but found no correlation with clutch size, environmental factors or nest characteristics.

This result confirms the discovery made in the 1990s of fossilized oviraptorosaurs stretched across their clutch, suggesting that they incubated their eggs.

No doubt some dinosaurs, weighing several dozen metric tons, could not lie on their eggs to incubate them, but they may have used other external heat sources, for example by covering their clutch with a mound of plant matter, which would have provided heat as it decomposed.

Males that were allowed to use their foam fathered significantly more chicks in each clutch than foamless ones, suggesting it gives sperm a boost in the race to fertilise eggs (Journal of Experimental Biology, doi.org/nb6).

Each clutch of eggs was fostered by another pair just prior to hatching.

A clutch of enormous fossil eggs from China has led to the discovery of a new species of giant bird - like dinosaur.

Archaeologists have unearthed a clutch of domesticated turkey eggs used as a ritual offering 1,500 years ago in Oaxaca, Mexico — some of the earliest evidence of turkey domestication.

«The fact that we see a full clutch of unhatched turkey eggs, along with other juvenile and adult turkey bones nearby, tells us that these birds were domesticated,» says Feinman.

Larger Pacific Striped octopus; image courtesy of Richard Ross Of the hundreds of known octopus species, most are anti-social, practice safe sex (to avoid getting eaten by a mate) and lay just one clutch of eggs before dying.The poorly understood larger Pacific striped octopus, however, seems to break from these conventions: They are somewhat social, they mate face - to - face, and the females produce multiple batches of offspring.The octopus is so rare that science has yet to even give it a formal Latin name.

A study in the journal Science looked at bones from dinosaurs found with clutches of eggs, and found that the caretakers appear to be male.

The female keeps a harem of up to four males, copulating, on average, 65 times per breeding season — far more than is necessary for fertilization — before laying a clutch of four eggs.

Birds that eventually rejected parasite eggs still laid an average - sized clutch of their own — even though the alien eggs remained at the top of the nest for several critical days before being buried.

After hatching and dispersing across the world's oceans, only the female leatherbacks return to their natal beaches to lay clutches of eggs in the sand.

The Australian researchers isolated a specific DNA marker for femininity in the lizard before exposing three additional clutches of eggs to varying temperatures.

She observed eggs that were exposed to two predators — parrot snakes and cat - eye snakes — and analyzed the vibrations caused when they attacked the clutch and captured some of the developing frogs.

Females will lay a clutch of eggs up to three times per year depending on the weather.

Additionally, unlike other octopus species in which females tend to die after producing a single clutch of eggs, female larger Pacific striped octopuses can lay many clutches of eggs continuously over the course of their adult lives.

If the eggs» bright colours were attracting predators, you would think that an egg was most likely to get eaten in the first few days after it is laid, before the clutch is completed and the male settles down to incubate them.

Females often share egg sites, laying their eggs together in a jumbled pile, and a female who spotted an existing clutch might well decide to add to it.

Once the female has finished laying her clutch, she hands over all responsibility for the eggs to a male — though not necessarily the male that fathered them.

While on exhibit, several pairs mated daily and produced multiple clutches of eggs, giving the team the opportunity to observe habits of brooding females as well.

One Komodo, named Flora, lives at the Chester Zoo in England and has never been kept with a male; yet a few months ago she laid a clutch of 11 eggs, eight of which seem to be developing normally and may hatch as soon as January.

Earlier this year, a now deceased female named Sungai from the London Zoo laid a clutch of 22 eggs, four of which yielded normal male dragons — even though Sungai hadn't had a date in two and a half years.

In 2006, staff members at two zoos in the United Kingdom identified two female Komodo dragons that each laid an unusual clutch of eggs.

In the lab, they played those vibrations back to other clutches to find out what kinds of vibrations caused the eggs to hatch.

In the Gamboa lab, to pinpoint at what age the visual reflex appears, Pérez, the student researcher, breaks open eggs from a single clutch oneat a time using forceps.

«Octopus females only produce one clutch of eggs in their lives.

For her thesis, Warkentin caged cat - eyed snakes (Leptodeira annulata) with clutches of 5 - day - old frog eggs and found that the embryos could hatch to escape.

«I bumped into a clutch [of eggs], and tadpoles were all over me,» she recalls.

Stranger still was that nearly all of the octopuses seemed to be mothers, each guarding a clutch of eggs.

When there were no father frogs guarding the eggs, less than 30 per cent of the eggs in a clutch survived,» said Mr Seshadri.

They settle down within it and over the course of about 9 hours lay a clutch of eggs, which the male then fertilises.

But there seemed to be little correlation between that shape and nest type, nest location, or the number of young in a clutch — all previous proposed explanations for the shape of eggs.

The researchers looked at correlations between egg shape and traits associated with the species of bird, including nest type and location, clutch size (the number of eggs laid at a time), diet and flight ability.

Because they mature quickly, are long - lived and produce large clutches of 20 to 35 eggs, the biologists reasoned that if immature lizards could be protected, tegus could withstand a commercial harvest.

By taking into account factors known to affect egg and clutch size in living bird species, the authors — who started their investigation last summer at the University of Lincoln's Riseholme campus — found that shared incubation was the ancestral incubation behaviour.

Females usually lay only two eggs, but in 1979, Merton found that if it loses a clutch, it will try again, so the birds have the potential to produce many more offspring than they actually do.

The scientists removed the first - laid clutches to encourage females to produce more eggs, but this meant that roughly half the young had to be reared by humans.