Much like any other commuter in Australia, Kangaroos have to obey certain. One of those laws is that all young must be restrained so that in event of an accident, say a mother Kangaroo misjudging the distance between her and a tree and slamming into it, the Joey isn’t flung about in the pouch.
The most common restraint for younger Joeys is a capsule, then a three-point restraint seat. See the table below.
Of course, just as not every adult human wears a seatbelt, not every parent Kangaroo is as concerned with safety as others. Those terrible parent Kangaroos tend to rely on the Joey being small and the strength of the pouch muscles to hold the Joey still. They are also likely to lay off too much bouncing once the Joey gets bigger.
Usually, the final straw is when the. Then it is time for the Joey to do its own bouncing and let mum have a rest.
Hope that helps.
This helpful answer originally appeared on Quora.