Co-author Irina Rotenko
In 2019-2020 in Naliboki Forest (central-western Belarus) by means of registration of tracks at tree butt and claw marks on trunk we found that in February-April lynxes used climbing on two pine trees which had a raven nest. After several lynx climbing the nests were almost destroyed and finally disappeared. We could not take photos of that lynx behaviour, however, all the signs, that we observed, definitely suggested that the lynxes were on the nests.
Perhaps, they used the nests as a suitable platform for territorial or mating calls from the height, at least. We already numerically proved that Eurasian lynx is characterized by such a behaviour (e.g. see several recent posts of this blog). So, there was nothing strange that lynxes choose trees with such large enough nest. Moreover, it occasionally happened that both pine trees were used by lynxes for climbing even before these raven nests appeared there.
Recently we visited one of the places. Raven built a nest again, but on the neighbouring dead pine. There were many lynx claw marks on the trunk. So, a lynx climbed this tree with the new raven nest, too.
In all the above cases we did not know about lynxes climbed the trees for a territorial or mating call only or for resting-watching as well. There was a good consistency that they rested and watched around from there too. In such a case those lynxes could stay on the nest platforms quite long.
One recent occasion helped to learn this question a bit more. Walking in the same forest, we heard calling by a lynx. It looked like the call was travelling from a height. There were many callings (more than 30), and we succeeded to approach the point. The lynx escaped before we see it. However, with tracks on snow cover and claw marks on the trunk we found that the lynx was calling from the big nest of spotted eagle. Taking into account when the last snowfall was, we estimated that the lynx stayed on the nest 18 hours, at least. So, it was not only calling from the nest, but also resting and watching from there.