Moses speaks to the Israelites as if they were one man, so the words "you" and "your" here are singular. (See: rc://en/ta/man/translate/figs-you)
a home that birds make for themselves out of sticks, grass, plants, and mud
"with baby birds or eggs in the nest"
"the mother bird is sitting on the baby birds"
Long days are a metaphor for a long life. See how you translated these words in Deuteronomy 4:26. AT: "be able to live a long time" (See: rc://en/ta/man/translate/figs-metaphor)