function showbirds(birdgroup){
	var item2 = document.getElementById("species");
	item2.options.length = 0;
	item2.options[0]=new Option('','');
if(birdgroup=="sandpiper"){
item2.options[1]=new Option('Common Sandpiper','1004');
item2.options[2]=new Option('Ruddy Turnstone','1007');
item2.options[3]=new Option('Sharp-tailed Sandpiper','1010');
item2.options[4]=new Option('Sanderling','1011');
item2.options[5]=new Option('Dunlin','1012');
item2.options[6]=new Option('Red Knot','1014');
item2.options[7]=new Option('Broad-billed Sandpiper','1051');
item2.options[8]=new Option('Curlew Sandpiper','1015');
item2.options[9]=new Option('Stilt Sandpiper','36640');
item2.options[10]=new Option('Western Sandpiper','1019');
item2.options[11]=new Option('Pectoral Sandpiper','36623');
item2.options[12]=new Option('Little Stint','1021');
item2.options[13]=new Option('Ruff','1070');
item2.options[14]=new Option('Spoon-billed Sandpiper','36641');
item2.options[15]=new Option('Red-necked Stint','1025');
item2.options[16]=new Option('Long-toed Stint','1026');
item2.options[17]=new Option('Buff-breasted Sandpiper','36644');
item2.options[18]=new Option('Temminck`s Stint','1027');
item2.options[19]=new Option('Great Knot','1028');
item2.options[20]=new Option('Common Snipe','1034');
item2.options[21]=new Option('Latham`s Snipe','1035');
item2.options[22]=new Option('Swinhoe`s Snipe','1040');
item2.options[23]=new Option('Pin-tailed Snipe','1046');
item2.options[24]=new Option('Long-billed Dowitcher','36649');
item2.options[25]=new Option('Asian Dowitcher','1054');
item2.options[26]=new Option('Bar-tailed Godwit','1057');
item2.options[27]=new Option('Black-tailed Godwit','1058');
item2.options[28]=new Option('Jack Snipe','36659');
item2.options[29]=new Option('Eurasian Curlew','1061');
item2.options[30]=new Option('Far Eastern Curlew','1063');
item2.options[31]=new Option('Little Curlew','1064');
item2.options[32]=new Option('Whimbrel','1065');
item2.options[33]=new Option('Red Phalarope','1068');
item2.options[34]=new Option('Red-necked Phalarope','1069');
item2.options[35]=new Option('Greater Painted-Snipe','1002');
item2.options[36]=new Option('Eurasian Woodcock','1080');
item2.options[37]=new Option('Gray-tailed Tattler','1049');
item2.options[38]=new Option('Spotted Redshank','1083');
item2.options[39]=new Option('Lesser Yellowlegs','36575');
item2.options[40]=new Option('Wood Sandpiper','1085');
item2.options[41]=new Option('Nordmann`s Greenshank','36571');
item2.options[42]=new Option('Wandering Tattler','36569');
item2.options[43]=new Option('Common Greenshank','1088');
item2.options[44]=new Option('Green Sandpiper','1089');
item2.options[45]=new Option('Marsh Sandpiper','1091');
item2.options[46]=new Option('Common Redshank','1092');
item2.options[47]=new Option('Terek Sandpiper','1094');
}
if(birdgroup=="plover"){
item2.options[1]=new Option('Kentish Plover','778');
item2.options[2]=new Option('Little Ringed Plover','784');
item2.options[3]=new Option('Common Ringed Plover','36473');
item2.options[4]=new Option('Greater Sand-Plover','789');
item2.options[5]=new Option('Lesser Sand-Plover','793');
item2.options[6]=new Option('Long-billed Plover','36477');
item2.options[7]=new Option('Oriental Plover','805');
item2.options[8]=new Option('Oriental Pratincole','854');
item2.options[9]=new Option('Black-winged Stilt','993');
item2.options[10]=new Option('Pacific Golden-Plover','815');
item2.options[11]=new Option('Black-bellied Plover','816');
item2.options[12]=new Option('Pied Avocet','1000');
item2.options[13]=new Option('Gray-headed Lapwing','823');
item2.options[14]=new Option('Northern Lapwing','842');
}
if(birdgroup=="gull"){
item2.options[1]=new Option('Gull-billed Tern','979');
item2.options[2]=new Option('Black-tailed Gull','909');
item2.options[3]=new Option('Aleutian Tern','36953');
item2.options[4]=new Option('Bridled Tern','961');
item2.options[5]=new Option('Saunders`s Gull','940');
item2.options[6]=new Option('Roseate Tern','969');
item2.options[7]=new Option('Common Tern','974');
item2.options[8]=new Option('Black-naped Tern','985');
item2.options[9]=new Option('Little Tern','958');
item2.options[10]=new Option('Great Crested Tern','966');
item2.options[11]=new Option('Chinese Crested Tern','37043');
}
if(birdgroup=="others"){
item2.options[1]=new Option('Great Egret','1149');
item2.options[2]=new Option('Chinese Egret','1154');
item2.options[3]=new Option('Little Egret','1155');
item2.options[4]=new Option('Pheasant-tailed Jacana','880');
item2.options[5]=new Option('Intermediate Egret','1176');
item2.options[6]=new Option('Brown Booby','8812');
}
}