﴿ وَتَفَقَّدَ ٱلطَّيْرَ فَقَالَ مَا لِىَ لَآ أَرَى ٱلْهُدْهُدَ أَمْ كَانَ مِنَ ٱلْغَآئِبِينَ ﴾

“And [one day] he looked in vain for [a parti­cular one of] the birds; and so he said: How is it that I do not see the hoopoe? Or could he be among the absent?”

Please check ayah 27:21 for complete tafsir.