table of heaviest living birds taken from net

Rank	Animal	Average mass [kg (lb)]	Maximum mass [kg (lb)]	Average total length [cm (ft)]
1	Ostrich	104 (230)[105]	156.8 (346)[105]	210 (6.9)[106]
2	Southern Cassowary	45 (99)[105]	85 (190)[107]	155 (5.1)[105]
3	Northern Cassowary	44 (97)[105]	75 (170)[105]	149 (4.9)[106]
4	Emu	33 (73)[105][108]	70 (150)[109]	153 (5)[105]
5	Emperor Penguin	31.5 (69)[106][110]	46 (100)[106]	114 (3.7)[106]
6	Greater Rhea	23 (51)[108]	40 (88)[106]	134 (4.4)[105]
7	Dwarf Cassowary	19.7 (43)[105]	34 (75)[105]	105 (3.4)[41]
8	Lesser Rhea	19.6 (43)[105]	28.6 (63)[105]	96 (3.2)[106]
9	King Penguin	13.6 (30)[106][110]	20 (44)[111]	92 (3)[43]
10	Dalmatian Pelican	11.5 (25)[106]	15 (33)[112]	170 (5.6)[106]