Stat HW help

If i were to analyze data about certain levels of a particular element in animals based on speciation what type of test should I run?

For example, say levels of nickel found in animals and you want to see which group of animals has the highest levels of that elements by like-group.

So far i have tried doing a similar test on age tho and created a new variable in SPSS using the visual binning and ive tried running a t test but that didnt give me the proper results. ive been trying to do freq test as well as summary and not sure how to correctly link the two variables togehter to get proper results
So you have many groups of animals and want to test whether they have the same levels of nickel (per some unit of blood?). Sounding like an ANOVA type problem so far.