Animal Reproduction

Female Grey Mouse Lemurs Are Extremely Promiscuous

November 17, 2021 0

Our smallest primate relative, the female grey mouse lemur (Microcebus murinus) is extremely promiscuous during their short breeding season (just a few days out of the year). These ladies are of a similar morphological size […]

Animal Parenting

Grandparents And Their Impact Based On Relatedness

November 10, 2021 0

We’ve talked extensively about the importance of grandmothers. Do grandfathers contribute to their collective fitness in a parallel way to their female counterparts? So far all the data suggest that they do not. This is […]

Animal Reproduction

Sperm Competition

November 3, 2021 0

Not all sperms are created equal. There is a great deal of variation in many aspects of sperm quality including morphology, mobility, and viability. As with all other aspects of biodiversity, there is tremendous selective […]

Animal Reproduction

Cryptic Female Choice

August 25, 2021 0

“Cryptic female choice” is essentially a female’s way of exercising some post-coital power over whose sperm will fertilize her eggs. There are many reasons why a female would want to retain some kind of control […]

Animal Reproduction

Male Rats Run Out Of Sperm But Still Engage In Sex

August 18, 2021 0

Rats (superfamily Muroidea) have a well-studied mating system that often involves males becoming sexually satiated. This means that they literally get tapped out of sperm and it takes approximately fifteen days for their fertility to […]

Animal Reproduction

Female Fire Salamanders Can Store Sperm For Months

July 14, 2021 0

In many anuran (frog and toad) species, females have a sperm-storage organ (a spermatheca) that enables them to keep sperm for long periods of time. This too can allow for the possibility of female choice […]