+/**
+ * Filter the default avatars.
+ *
+ * Avatars are stored in key/value pairs, where the key is option value,
+ * and the name is the displayed avatar name.
+ *
+ * @since 2.6.0
+ *
+ * @param array $avatar_defaults Array of default avatars.
+ */
+$avatar_defaults = apply_filters( 'avatar_defaults', $avatar_defaults );