2006-12-21 23:52:32 · 14 answers · asked by nat 3 in Science & Mathematics ➔ Zoology
Some great answers out there.
Basically depends upon your definition.
Morphologically (appearance) a belly button per se is the remnants of a TIED placent and as such is unique to humans. However if you relax the deinition to not require the tied remnants, thn a belly button is just the remains of the placent attachment site, may or may not be conspicoius but will be present in all placental animals (includes mammales so yes your cats has one).
BUT not all live born animals are of placental origins as implied in some answers, so no not all live born animals will have one
For an extreme example tstese flies or aphids (BTW insects are animals) give live birth but will not have belly buttons as they are not placental.
enjoy, keep asking and learning and have a nice vacation / life
2006-12-22 01:59:52 · answer #1 · answered by symbiont 2 · 1⤊ 0⤋
All placental mammals do indeed have navels; however, the physical appearance of navel varies considerably, even among humans, being determined by underlying layers of muscle, fat, and connective tissue. In dogs and cats, the scarring over of this area is nearly complete, and also being covered with hair, the navel may be difficult to detect in adult animals. As for 'belly buttons,' I have never seen any authorative discourse on the shapes of mammalian navels in general, so I can neither affirm nor refute the statement on humans being the only mammal with a true 'belly button.' See http://academic.algonquincollege.com/students/steg0003/origins.html for a little more on this subject.
Hope this helps.
2006-12-22 00:45:10 · answer #2 · answered by Nerd RockR 2 · 0⤊ 0⤋
Yes.. mammals have a belly button because they had an embilical cord attached
2006-12-22 02:08:01 · answer #3 · answered by Benjamin J 1 · 1⤊ 0⤋
All mammals have belly buttons. However, in some dogs and cats, they're a little hard to see because they've healed well and they are covered with hair.
http://www.abc.net.au/science/k2/lint/results.htm
2006-12-22 00:44:19 · answer #4 · answered by cajadman 3 · 0⤊ 0⤋
Had an umbilical cord? Have a belly button.
2006-12-21 23:54:27 · answer #5 · answered by Dirk Diggler 2 · 0⤊ 1⤋
All the live-born animals have one, because they were connected to their mother by the cord when in the womb. Mothers usually chew it off when pups are born, ir it falls off, but all the mammals have it.
2006-12-22 00:01:31 · answer #6 · answered by Ymmo the Heathen 7 · 2⤊ 0⤋
Only those belonging to the class mammals have
2006-12-22 01:53:45 · answer #7 · answered by Jim G 5 · 0⤊ 0⤋
They have them but they only look like a little scar.
Not exactly round like humans have.
2006-12-22 00:02:53 · answer #8 · answered by Cuddly Lez 6 · 0⤊ 0⤋
yes
2006-12-22 03:47:15 · answer #9 · answered by hill bill y 6 · 0⤊ 0⤋
yes they do.. Only those animals that give birth and not eggs..
2006-12-21 23:55:28 · answer #10 · answered by alice_nobleandkind 2 · 0⤊ 1⤋