Nah, it's because of the pulsars' property to flash, as it practically resembles a lightwatch. It's like it's blinking when you see it. You see that radio beam in the centre? When it's directed at the earth, the star is visible to us. When it isn't, it's not visible to us. So supposing a pulsar has period of 1sec (this one has less than 100ms), it will be flashing every second. Therefore flippin' duck... Doesn't the whole nebula thing resemble Donald duck? :P
I know what a pulsar is >_> I meant the duck aspect of the name. I think it much more resembles an upside down duckling or chick =/
