Yes, the spring peepers are significant to me every year,
but it is
another life form that clenches it for me, spring-wise:

the earthworm.

Today, after a night and a morning of rain,
the earthworms are out of the soil
and positively cluttering the concrete pavement.
I'm darned if I know
what an earthworm is trying to accomplish
on concrete pavement, but there it is.