A worldwide catastrophe is underway among an extraordinary group of birds — the marathon migrants we know as shorebirds. Numbers of some species are falling so quickly that many biologists fear an imminent planet-wide wave of extinctions.
By John W. Fitzpatrick and Nathan R. Senner
Origins of bird ringing reach back to the 18th century. First such tagged birds were swallows, when ornithologists tried to prove that they migrate South, with the help of a piece of twine. Foundations of systematic ringing were laid a hudred years ago by Hans Christian Cornelius Mortensen, who started to tag starlings nesting in his nest boxes.
The Eurasian eagle-owls (Bubo bubo) are the largest owls living in Slovakia – their wing-span reaches 160 - 180 cm.
One of the most common questions we are frequently asked is whether birds do abandon their nestlings after their contact with people. With the exception of vultures, sense of smell does not play as important role for most of birds of prey, as it does for some mammals.