2006-07-24 20:49:09 · 6 answers · asked by amnesty 2 in Science & Mathematics ➔ Biology
all but platypus's. because they lay eggs.
2006-07-24 20:53:14 · answer #1 · answered by Phillip R 4 · 6⤊ 3⤋
In other mammals the uterine lining is simply reabsorbed when the fertile period ends. Only in human females is this lining actually shed.
The other point that others were making is that no other mammal is fertile once a month, every month. Most mammalian females are only fertile during a particular mating season and in others that don't have a distinct mating season they are only fertile once or twice a year.
2006-07-25 04:52:55 · answer #2 · answered by scientia 3 · 0⤊ 0⤋
"Only human beings and the great apes experience a true menstrual cycle. Most placental mammals experience estrus instead. The menstrual cycle is under the control of the reproductive hormone system and is necessary for reproduction."
2006-07-25 03:56:20 · answer #3 · answered by ? 3 · 0⤊ 0⤋
yes they vary in legth and can involve the loss of little blood like humans or not, but generally any mammal that has an in uterous pregnancy at some stage has the maturation of the ovum with consequent period
2006-07-25 12:24:21 · answer #4 · answered by Prof. Hubert Farnsworth 4 · 0⤊ 0⤋
if u mean meanstration cycle than only human have period
2006-07-25 04:02:33 · answer #5 · answered by mariz s 2 · 0⤊ 0⤋
i think so
that is why they are called mamals
2006-07-25 03:53:55 · answer #6 · answered by halfanimation 1 · 0⤊ 0⤋