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 […]
Animal Reproduction

Is There A Reason For Menopause?

June 9, 2021 1
Menopause – why would such a strategy evolve? After all, males retain the ability to procreate until the end of their life cycles (albeit with reduced success for both physical and social reasons). Why haven’t […]
Animal Reproduction

Humans vs. The Animal Kingdom

June 2, 2021 0
One of the things that fascinates me the most about sex is the fact that our own species does so many things so differently than the rest of the animal kingdom. Essentially, humans have taken […]
Animal Reproduction

Several Bird Species Can Store Sperm

May 26, 2021 0
The ability of females in many animal taxa to store sperm is a contributing factor to their level of control over which sperm to select when the time comes to fertilize an egg. A female […]
Animal Reproduction

Female Pygmy Squid Prefer Smaller Males

May 5, 2021 0
Male pygmy squid (Idiosepius paradoxus) attach their spermatophores to the outside of their partner’s body, and multiple males can make such deposits. This leaves females with the choice of which spermatophore to accept, and they […]