Be aware that WSU's Bachelor of Science (Zoology)/Bachelor of Natural Science (Animal Science) program will not be offered in 2022. If you wish to study Animal Science at WSU, you may do so by enrolling in a Bachelor of Science (Animal Science) or the Bachelor of Advanced Science (Animal Science), which is designed for high achieving students:
USyd's Bachelor of Science and Bachelor of Advanced Studies (Animal and Veterinary Bioscience) program also seems like a good option:
Regarding internal vs external transfers, as mentioned above, internal transfers may be easier to execute, due to the fact that you will be transferring to a different degree within the same university. However, academic achievement (i.e. results and GPA/WAM) is also an important consideration. If you are able to achieve great results, leading to a great GPA/WAM at a different institution, then an external transfer will not be as difficult.
In terms of ATAR requirements for each degree listed (which may assist you in choosing which program to undertake), they are as follows:
- Bachelor of Advanced Science (WSU) - 95
- Bachelor of Science and Bachelor of Advanced Studies (USyd) - 80
- Bachelor of Science (WSU) - 70
I hope this helps!