Because they fulfill the criteria needed to be mammals. Among which are that they are vertebrates, hairy, and they suckle their young.
They can get the flue and other disseses from other mammels
No
what are mammels that live on land called? they are called terresteral creatures
As with most 'higher' mammals tigers have both innate and learned behaviour. The ability to hunt is probably innate. What to hunt, how and where more of a learned practice. Hence many mammels stay with their parents for varying periods of time.
yes
Yes.
mammalogist
Yes.
Yes they are.
No they have gills
Yes.
yes