  We consider the population of black widow pulsars (BWPs). The large majority
of these are members of globular clusters. For minimum companion masses < 0.1
Msun, adiabatic evolution and consequent mass loss under gravitational
radiation appear to provide a coherent explanation of all observable
properties. We suggest that the group of BWPs with minimum companion masses >
0.1 Msun are systems relaxing to equilibrium after a relatively recent capture
event. We point out that all binary millisecond pulsars (MSPs) with orbital
periods P < 10 h are BWPs (our line of sight allows us to see the eclipses in
10 out of 16 cases). This implies that recycled MSPs emit either in a wide fan
beam or a pencil beam close to the spin plane. Simple evolutionary ideas favour
a fan beam.
