All mammals feed their young. Belug

All mammals feed their young. Beluga whale mothers, for example, nurse their calves for
some twenty months, until they are about to give birth again and their young are able to
find their own food. The behavior of feeding of the young is built into the reproductive
Line system. It is a nonelective part of parental care and the defining feature of a mammal, the
(5) most important thing that mammals-- whether marsupials, platypuses, spiny anteaters, or
placental mammals -- have in common.

But not all animal parents, even those that tend their offspring to the point of hatching or
birth, feed their young. Most egg-guarding fish do not, for the simple reason that their
young are so much smaller than the parents and eat food that is also much smaller than
(10) the food eaten by adults. In reptiles, the crocodile mother protects her young after they
have hatched and takes them down to the water, where they will find food, but she does
not actually feed them. Few insects feed their young after hatching, but some make other
arrangement, provisioning their cells and nests with caterpillars and spiders that they have
paralyzed with their venom and stored in a state of suspended animation so that their
(15) larvae might have a supply of fresh food when they hatch.

For animals other than mammals, then, feeding is not intrinsic to parental care. Animals
add it to their reproductive strategies to give them an edge in their lifelong quest for
descendants. The most vulnerable moment in any animal's life is when it first finds itself
completely on its own, when it must forage and fend for itself. Feeding postpones that
(20) moment until a young animal has grown to such a size that it is better able to cope. Young
that are fed by their parents become nutritionally independent at a much greater fraction
of their full adult size. And in the meantime those young are shielded against the vagaries
of fluctuating of difficult-to-find supplies. Once a species does take the step of feeding its
young, the young become totally dependent on the extra effort. If both parents are
(25) removed, the young generally do no survive.

Kết quả (Anh) 2:

All mammals feed young chúng. Beluga whale mothers, for example, ask for their nurse Calves for
some twenty months, an until chúng about to give birth again and ask for their young are thể
find food Their Own. The behavior of feeding of the young is built Into the reproductive
Line system. It is a part of parental care nonelective and the defining feature of a mammal, the
(5) Most Important Thing That mammals-- nếu marsupials, platypuses, spiny anteaters, or
placental mammals - have in common. But not all animal parents, Tend có có những thậm offspring to the point of hatching or birth, ask for their feed young. Most egg-Guarding fish do not, for the simple lý có có smaller young are so much coal and eat food the parents nằm am also much smaller coal (10) the food eaten by adults. In reptiles, the crocodile mother after chúng Protects the her young have hatched and takes them down to the water, where chúng will find food, but SHE does not Actually feed added. Few insects feed after hatching young chúng, but some make other arrangement, ask for their provisioning cells with caterpillars and spiders and Nests have chúng có có paralyzed with venom and stored in a state of animation để có SUSPENDED (15) larvae to might have a supply of khi chúng hatch fresh food. For other animals mammals coal, then, feeding is not intrinsic to the parental care. Animals add it to ask for their reproductive Strategies to give an added edge trong Lifelong Quest for descendants. The most Vulnerable in any animal's life moment is khi first chính nó finds completely on its own, forage and fend khi phải for chính nó. Feeding postpones mà (20) torque off until a young animal has grown to such 'a little truth is better size thể cope. Young parents ask for their được trở nutritionally fed by a much greater fraction independent at full adult size of chúng. And in the meantime young những are shielded Against the vagaries of fluctuating of Difficult-to-find supplies. Once a species does take the step of feeding its young, totally dependent on the young trở the extra effort. If parents are cả (25) unaligned, the young Generally survive due no.