Unlike mammals, birds lay eggs and initial stages of development ... However, only the left Mullerian duct (and usually only the left ovary) develops. Male reproductive system is straightforward.

All mammals have a particular protein on the surface of sperm called CatSper. It controls the entry of the particles needed ...

How do behavior, morphology and physiology act in concert to improve a male's reproductive ... differences in potential reproductive rates characteristic of all mammals (Trivers 1972, Clutton ...

In mammals, male and female reproductive structures are found in separate individuals. If an egg is fertilised by a sperm in the oviduct then it divides a number of times then implants into the ...

In mammals—including us humans—sperm are surprisingly picky about temperature, thriving best in conditions a few degrees ...

The male and female reproductive system The male reproductive system ... Dolly the sheep was the first mammal to be cloned. She was born in the UK in 1996 and died in 2003. She was produced ...

Mammalian evolution has developed ingenious ways to keep male reproductive ... elephants use a similar system that cools blood through their ears. Most other mammals, humans included, create ...

Sperm swim faster in high temperature environments; aging ovaries slowly lose egg support. Both affect fertility differently.

Unlike mammals, birds lay eggs and initial stages of development ... However, only the left Mullerian duct (and usually only the left ovary) develops. Male reproductive system is straightforward.