Looking for a site that tracks horse odds as they change

Hi there,

Rookie question and a bit of a repeat

i'm interested in how odds for various horses change from the time they are posted until the race starts

is there a site that offers this service?

ie. a horse opens at 8-1 then moves to 6-1 and 4-1, etc....

is there anywhere that tracks this type of information?

Thinking about it more, it's a lot of data given how many tracks and races there are.

But perhaps there is a site out there that looks at some sort of historical data?

Would appreciate any insight

thanks!