I'm moving into an apartment with my cockatoo, and in thinking about sound level I realized I've never actually seen a source for the claim I've heard quite often and passively believed myself:
Cockatoos can scream as loud as a jet engine!
You can see this repeated over and over just by searching for "cockatoo scream jet engine".
The claim itself lacks any real units, but often recited in decibels. This site suggests in a comment:
Sun Conures are the loudest birds there is. Easily as loud as a jet engine. They scream at dawn and at dusk. It's instinct and they can't be trained out of it.
And this site says:
Most cockatoos will scream for about 20 to 40 minutes a day, for no reason. And, yes, they are very loud. The amount of decibels(unit of measurement for sound) their loudest scream has is greater than that of a jet engine.
My own original attempt at linking the two is noting that a jet engine (at 100 feet) is 140 dB (doubling the distance makes it about 134 dB, which would still be as "loud as a jet engine", to me), and (apparently) a Moluccan cockatoo can reach 135 dB. But how is the latter figure being measured? At what distance and with what reference level? Has it been measured at all or is it just a guess? Where's the source?
My cockatoo is not a Moluccan, but I can attest that at times he can be loud. I don't think, however, that the short-lived mid-to-high pitched screams of a bird can compare in loudness to the continuous rumbling of a jet engine.
Are there any studies regarding such comparisons, or the loudness of cockatoos, or is it bogus?