function buildCatList(list, returnVal, fn) {
        setTimeout(function (name) {
        console.log(name);
            var catList = list === '' ? name : list + ',' + name;
            fn(catList);
        }, 1, returnVal);
    }


    buildCatList('', 'Panther', getJanguar);

    function getJanguar(list) {
        buildCatList(list, 'Janguar', getLynx);
    }

    function getLynx(list) {
        buildCatList(list, 'Lynx', getSnowLeopard);
    }

    function getSnowLeopard(list) {
        buildCatList(list, 'Snow Leopard', getLion);
    }

    function getLion(list) {
        buildCatList(list, 'Lion',print);
    }

    function print(list) {
        console.log(list);
    }