Such is the quality of conversation in our household that when I discussed this with my family at dinner, my youngest son suggested the answer was ‘loud flatulence’. I questioned whether this was a “skill”, to which I was met with a knowing smile.
Not flatulence Andy, though it does have something to do with sound - although not for our ears.
You're actually moving in the right direction Fez. It is true that tigers can mimic the mating calls of some of the prey - notably deer and sloth bears - it has even been recorded on tape where a captive tiger was trying to imitate the sound of a moving vehicle
However - that is not what I am looking for. It just shows that tigers are capable of a wide variety of vocalizations, not normal for your average kitty (or even for lions) ! It has to do with vocalization.
Close enough BB. All the mammals on the list are capable of producing infrasound - vocals which are outside the range 20 Hertz to 20,000 Hertz, which is the range which the human ear can detect, althouth our ears function best between 500 and 1,000. Anything which is below the frequency of 20 Hertz (cycles per second) cannot be heard by us, but can be felt in some cases. These sound waves can also travel long distances - the lower the frequency the farther the distance the sound can travel. This is how whales can communicate over distances of up to 10,000 miles ! Rhinos, Hippos and Giraffes also have this ability though not as dramatic as the whale - Elephants can also communicate over long distances in this way, without us hearing a thing. The biggest surprise is the tiger - a tiger's roar can produce sounds which go way below 18 Hertz - and a person standing close by will not only hear it, but also feel it - in short it may rattle you, and a temporary paralysis is possible. This is used by tigers to communicate over long distances - the roar itself is heard up to 3km away, but it can be detected over much farther distances - and would be detectable to a competitor or to a potential mate. Needless to say such a skill is not used whilst hunting, when surprise and silence would be the order of the day. Over to you.
Is this in the sense of fossilized roots ? In which case there is a site near Cairo where researchers think they have discovered the remains of the World's oldest forest. Or am I barking up the wrong tree !
No - these appear to grow in heavy rainfall. They're a type of sandstone that secretes cement - found in Europe about 1800km South East from you if that's any help.
1800 Km South East of Cologne
So......not quite Greece or Turkey. Definitely a Balkan touch here. Bulgaria is also just outside this range 
So a little bit north of there eg. Romania. In which case the stones of Costesti ?
That's the ones.1800 Km South East of Cologne
The 'crown prince' and the 'biological father' were different people. He only actually saw his biological father on a couple of occasions. A musical question.
