The goal is to track individual birds over several years.

The last thing I need right now is mud tracked all over the house.

Since case control studies don't track patients over time, they can't establish relative risk.

Both groups of students will be tracked over a 2 year period.

The software will be able to track players' scores over the course of a day, week or month.

A cold front also was tracking over Britain at this time.

But what if you want to track the sales rank of specific items over time?

A psychologist might need to track a drug whose effectiveness changes over time.

I don't think even hounds could track us over the running water.