IshLevit 71:20 :ܝܘܢܝܐ܃ ܚܠܦ ܢܫܪܐ ܘܕܝܬܐ܃ ܢܫܪܐ ܘܨܦܪ ܦܝܠܐ ܐ݁ܡܪ܂ ܨܦܪ ܦܝܠܐ ܦܪܚܬܐ ܗܝ ܕܐܝܟ ܕܐܡܪܝܢ܂ ܛܥܢܐ ܠܣܘܣܝܐ ܘܪܟܒܗ܂‏ : the Greek instead of ܢܫܪܐ ܘܕܝܬܐ has ܢܫܪܐ ܘܨܦܪ ܦܝܠܐ; the "elephant bird" is a bird, as they say, that can carry the horse and its rider
See the entire entry for ṣeppar, ṣeppɘrā n.f./m. bird