“…As we have mentioned earlier, several studies have lent support to the homophily hypothesis, according to which children choose playmates among those who are more similar to themselves, namely in terms of PA levels (e.g., Espelage et al., ; Snyder et al., ). A recent study has shown that, already in preschool, children might be sensitive to behavioral cues, which allow them to select peers based on similarity (see DeLay, Hanish, Martin, & Fabes, ). Consistent with this, it is important that future research addresses issues of selective play, considering that aspects such as similar aggressive behavior or gender may be better ways of studying peer composition (see Fabes et al., ).…”