In an attempt to gather valuable shark conservation data that looks at reproduction rates and population growth, researchers from the University of North Florida have moved from common dissection to the less invasive, and maybe more interesting, method of non-lethal ultrasound.
Elephants are long-lived animals that continue to reproduce at an old age. Researchers believe this provides both the individual and offspring with certain advantages, including passing down valuable environmental and social knowledge.
National Park Service biologists recently discovered two mountain lion kittens in the Santa Monica Mountains in California. The pair's mother is thought to be a well-tracked mountain lion designated as P-19, but DNA testing is underway to confirm who their father is. Nonetheless, researchers say this successful birth highlights the habitat quality of the Santa Monica Mountains.
Virgin births, scientifically called parthenogenesis, may be more common among snakes than previously thought. Understanding this sort of reproduction sheds light on the evolutionary history of vertebrates, researchers say.
Gender of many reptiles, including crocodilians and turtles, is largely determined by the temperature in which eggs incubate. When taking a closer look at the molecular mechanisms behind this phenomena known as temperature-dependent sex determination, researchers discovered a thermosentive protein inside the egg plays a key role.
A 50-year study recently revealed that southern giant petrel seabirds living on the Antarctic island of Signy have experienced substantial population declines and reduced breeding success.
Sexual cannibalism is common among many species. But a new study is challenging the belief that female spiders attack their mates after sex because they can't control their aggressiveness, and instead suggests females are testing males so that they can weed out the weak ones.
Giants pandas give birth to more cubs when they are able to choose their mates, a new study revealed. This may help conservationists better protect these endangered animals.
Cheetahs migrated to Africa from North America 100,000 years ago during the last Ice Age. Following their "big move," populations dwindled and incestuous breeding increased. This troubled linage has had a lasting impact on modern Cheetahs, many of which have difficulty reproducing due to a gene mutation that affects sperm development.
For many species, including humans, sex is determined by sex chromosomes. However, this is not the case for ants, wasps and bees. A recent study sheds light on the evolution of sex determination in ants and how inbreeding can lead to sterile males.
The oldest known bird -- an albatross named Wisdom -- is about to lay another egg at 64 years old. Researchers believe she has raised as many as 36 chicks and clocked over six million ocean miles of flight time.
A study of the porosity of ancient archosaur eggshells is tipping scientists off about the kinds of nests they once called home.
A male's sperm has one job -- to fertilize a female's eggs. So why is sperm from rodents so much longer than that of larger mammals, such as primates, tigers and even whales? Researchers may now have the answer.
A new study confirms that a well-preserved fetus and soft tissues were found in 48-million-year-old fossils of a small horse-like species.