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.

Menopause – why would such a strategy evolve? After all, males retain the ability to procreate until the end of their life cycles (albeit with

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 ability of females in many animal taxa to store sperm is a contributing factor to their level of control over which sperm to select

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

Mouth-brooding female cichlids (family Cichlidae) are in control of both pre- and post-mating sexual selection. In this highly specialized mating system, females gather up their

Environmental variation can wreak havoc on animals that use auditory signals to find mates. Ever tried to carry on a conversation with a potential mate

Externally fertilizing fish provide several fascinating examples of cryptic female choice at work. In these systems, females lay their eggs in nests on the floor