Offspring are a creature's young — its children, in the language of biology. Their offspring, produce offspring, the offspring survived.
The word is the same in singular and plural, which is unusual, and it is neutral about number and sex — useful in science, cold in ordinary speech. The Old English is off plus spring, those who spring off the parent.
1nounoffspringA creature's young.
“The mother bird feeds her offspring until they are old enough to fly.”
offspring is young.
Old English ofspring is off plus spring — those who spring from a parent.
Old English
ofspring — offspring, descendants, posterity
Middle English
ofspring
English, today
offspring
From Middle English ofspring, from Old English ofspring (“offspring, descendants, posterity”), equivalent to off + spring. Compare Icelandic afspringur (“offspring”). More at off, spring.
Etymology from Wiktionary, CC BY-SA