Setting the stage ...

Boredom plus a touch of hormones drives Elahn to sniff other llamas' butts (he doesn't know why some attract him more than others, and he doesn't care ... yet). Gaiya has no interest in having her boundaries violated for no reason, so off she goes ... keeping both ears and a portion of her visual attention on Elahn.

If the two were to remain together long enough, this would eventually become a sexual pursuit. Right now it's kid stuff, and good exercise (and a better alternative than eating non-stop — obesity is a problem in North American llamas, too).