I would add to Rauls' great ov photos and what has been said by all -- that is also a "feel thing" for me.
A female in FULL ovulation will remain so for 24-36 hrs. in most cases. During that full ov they will feel TIGHT -- like their shin is going to rip at the area of ovulation. If you can bounce a quarter off their belly -- they are ovulating.
Give them a gentle squeeze and "feel the swell"!!!![]()