Tern make up the clutch. Most species feed on fish caught by diving from flight, but the marsh terns are insect-eaters, and some large terns will supplement their diet with small land vertebrates. Many terns are long-distance migrants, and the Arctic tern may see more daylight in a year than any other animal. Terns are long-lived birds and are relatively free from natural predators and parasites; most species are declining in numbers due directly or indirectly to human activities, including habitat loss, pollution, disturbance, and predation by introduced mammals. The Chinese crested tern is in a critical situation and three other
Numerology summing digits in these bases yields different results. The first example, shown above, appears thus when rendered in octal (base 8): The Arabic system of numerology is known as Abjad notation or Abjad numerals. In this system each letter of Arabic alphabet has a numerical value. This system is the foundation of "ilm-ul-cipher", the Science of Cipher, and "ilm-ul-huroof", the Science of Alphabet: ط=9 ح=8 ز=7 و=6 ه=5 د=4 ج=3 ب=2 أ=1 ص=90 ف=80 ع=70 س=60 ن=50 م=40 ل=30 ك=20 ي=10 ظ=900 ض=800 ذ=700 خ=600 ث=500 ت=400 ش=300 ر=200 ق=100 غ=1000 Some Chinese assign a different set of meanings to