Natyashastra
वाहनं कुञ्जराणां तु स्थूलपक्षिनिरूपणम् । अस्यैव दक्षिणं पादं पञ्च तालान् प्रसार्य तु ॥ ६७॥
This posture is used for riding elephants and mimicking large birds. Extending the right foot five Tālas forward produces the Ālīḍha stance.
english translation
vAhanaM kuJjarANAM tu sthUlapakSinirUpaNam । asyaiva dakSiNaM pAdaM paJca tAlAn prasArya tu ॥ 67॥
hk transliteration by Sanscript