ostrich: [13] Greek strouthós seems originally to have meant ‘sparrow’. Mégas strouthós ‘great sparrow’ – the understatement of the ancient world – was used for ‘ostrich’, and the ‘ostrich’ was also called strouthokámelos, because of its long camel-like neck. Eventually strouthós came to be used on its own for ‘ostrich’. From it was derived strouthíōn ‘ostrich’, which passed into late Latin as strūthiō (source of English struthious ‘ostrich-like’ [18]).
Combined with Latin avis ‘bird’ (source of English augur, aviary, etc) this produced Vulgar Latin *avistrūthius, which passed into English via Old French ostrusce as ostrich. => struthious[ostrich etymology, ostrich origin, 英语词源]