I agree. An understanding of animals is part of successfully using snares.

Other useful skills that will help:
The ability to read tracks and droppings to determine whether the particular animal one is attempting to snare can indeed be snared with the equipment on hand and/or what type of snare or trap would be best suited to catch whatever animal is leaving the aforementioned signs.

The ability to locate trails within the landscape that animals use consistently to travel to and from either food or water sources and/or how and with what to bait a snare or trap that will lure an animal out and/or the ability to locate dens, burrows, nests and other places that animals will consistently return to or leave.

Setting multiple snares in a variety of areas that animals tend to travel will up the odds.

The ability to masks one's own sent and other signs that will alert an animal to a dangerous presence is important.

The best time to set a snare or trap so that an animal won't happen across one during their routine

And so on...

Bee, Unfortunately I don't know of any sites on the web off the top of my head that offer a whole lot more information that you wouldn't already find in the US Army SurvivalFM21-76 or in the SAS Survival Handbook. However, if I run across one or two I'll try to get the links to you.

I learned most of what I know in this area from other people including older family members that grew up in a time or area of the world where this type of information was important. This type of information still is important of course, but it has been a generation or three since it was commonly considered as such unfortunately.