linux - why doesn't watch work when piping the output of fortune into cowsay -

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cowsay silly linux tool displaying cow saying given text in terminal.

$ cowsay hello

fortune silly linux displaying "random" quote in terminal.

$ fortune

both of these commands can repeatedly ran in terminal using watch e.g.

$ watch cowsay hello $ watch fortune

additionally these 2 commands can combined cow says "random" quotes. piping output of fortune cowsay.

$ fortune | cowsay

however combination of use of watch , piping output of fortune cowsay doesn't anything.... i.e. hangs until process ended

$ watch fortune | cowsay

does know why?

with watch fortune | cowsay piping output of watch fortune cowsay. want watch value of fortune piped cowsay should quote watch whole command execute as

watch 'fortune | cowsay'

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