hey there, im looking to do a PHD in physiology but will be in NZ for the coming year, is there any websites that have details of labs looking for people to work for them during the summer peiod?

Occasionally such short term 'work experience' type positions arise. What you'll need is inside knowledge. Talk to your current or former course tutors and ask them to put feelers out. When people appoint for such a short period of time they usually want somebody they know or who has been recommended.