Dealing with wildlife is tricky, animals react in different ways even within their own species, as a wildlife rescue it is our job to know how certain animals react, the dangers posed to them and to us, as well as ensuring they are handled properly and returned safely to the wild.

Unfortunately many people think animals are very easy to deal with. Find a possum you want moved? just trap and move it. Kangaroo loose in paddock? just chase and catch it.
Problem with this is it will, more often than not, result in the death of the animal.

They look cute, but it takes a long time to learn how to handle the various species of animal found in a responsible manner. This is a wombat and kangaroo that came in and have been handraised.

What not to do

To take it back a step this is inspired by a post I saw on Steemit earlier. A man put up photos of a possum that his neighbor wanted moved to stop it "pooing on the porch". They set up a humane trap and then took it a fair distance away where they knew other possums lived. Thing is, possums are highly territorial, aside from being illegal trapping and moving a possum to a different area will result in the other possums who live there attacking and killing the intruder. I know they were trying to do the right thing but unfortunately misguided intentions probably resulted in the death of the poor possum.

Another case I had the other day was when someone "found" a baby magpie and brought it into the shelter. Magpies as they are reaching maturity will "fall" from the nest and the parents will hang around feeding and caring for it until it can become independent. If taken away from the parents the chance of survival becomes much smaller even if fed and looked after. He was doing well for a few days and then went downhill very quickly and passed away. Had they left him be he probably would still be alive.

Kangaroos, Wallabies and other macropods suffer from a stupidly bad evolutionary trait called myopathy. Basically myopathy is a stress related condition that affects the muscles. When the animals become stressed like when chased or injured acute myopathy can occur and result in the breakdown of cardiac muscles resulting in death. If a joey kangaroo gets acute myopathy there is an almost 0% chance of survival and adults aren't much better.
This means if someone were to try and chase/capture and relocate a roo or to try and look after a joey without the right knowledge how it could easily succumb to stress and die.

What you should do!

Call your local wildlife shelter or ranger. Not only is it free and they will come handle the issue for you, they will ensure it is done in a way where neither human or animal is harmed(at least minimally, I have been scratched and bitten many times but better me than you right?)

They will not only know how to handle the animal but where best to release it, for example if it cannot be released into it's former home it may need to slowly be introduced to a new area, unfortunately many animals are territorial and we cannot just "move them" because you don't want them there. We share the world with animals and we need to learn to share it better.

source

I know you're trying to help, I appreciate the sentiment.

I know most of the time their heart is in the right place, they tried to do the right thing. Unfortunately good intentions don't excuse the damage done. I don't try and lecture people or get mad when they do it, It's far better to help them learn and understand. After all I'm still learning too.
At the absolute least give a wildlife rescue a call and ask their advice, in some cases it is something you can easily do yourself, or they will have a solution over the phone that hopefully doesn't require moving the animal.

If anyone has any questions regarding Australian animals specifically I'd be happy to try and answer them, I don't claim to be an expert but I am always learning and keen to share my knowledge and spread the word.

Thanks for reading :)