Swallows of a pair before making a nest that stops side by side

जानवरों / Swallows of a pair before making a nest that stops side by side
मौसम-घटनाक्रम / Swallows of a pair before making a nest that stops side by side
प्रकृति-लैंडस्केप / Swallows of a pair before making a nest that stops side by side