Cats-still my number one interest! (For some reason, Siamese cats in particular were an interest of mine ever since I was very small. My first Siamese, Samantha, came into my life when I was in high school and was my best friend for 20 years.)
Horses-I loved horses when I was in early elementary school.
Dogs-dachshunds were my favorites
Medical topics-I became interested in reading the Reader's Digest Family Health Guide and Medical Encyclopedia when I was in third grade.
Astronomy/the planets-also third grade
World Cultures-Japan and Greece were the two countries, other than my birthplace, Germany, I began researching in depth. This began when I was in sixth grade.
In high school, when I was taking Spanish, Spain and Argentina were countries I researched in detail.