Java SecureRandom, using NativePRNG (i.e. /dev/urandom) does not need to be re-seeded?

I was wondering, does the Java SecureRandom RNG need to be periodically be re-seeded? I'm assuming the underlying NativePRNG's algorithm reseeds if necessary. For example Yarrow on OS-X appears (and please correct me if I'm wrong) to re-seed from the entropy pool whenever enough entropy is available (I'm assuming that is like Fortuna).

I'm not sure what the underlying algorithm is for Linux.