Question: solving two coupled equations

how can i solve two coupled differential equations like these: s1 := diff(n[D](t), t) = a-b*n[D](t)^2-c*n[D](t)-e*n[D](t)*n[T](t); s2 := diff(n[T](t), t) = b*n[D](t)^2-c*n[D](t)-e*n[D](t)*n[T](t); why dsolve({s1, s2,n[T](0)=0}) gives error?
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