Fom the mid-1990s, Wojtusiak concentrated on the mountainous areas of South America, participating in or organising more than ten scientific expeditions into the Andes, which resulted in more than 100 scientific publications and descriptions of more than 400 new species of butterflies and moths, principally belonging to the Tortricidae family, in co-authorship with Professor Józef Razowski.
Janusz Korczak | Janusz Kusociński | Janusz Radziwiłł | Janusz Radziwiłł (1612-1655) | Janusz Tazbir | Janusz Różycki | Janusz Kurtyka | Janusz Centka | Janusz A. Zajdel Award | Janusz Zajdel | Janusz Witwicki | Janusz Spyra | Janusz Skumin Tyszkiewicz | Janusz Radziwiłł (1612–1655) | Janusz Minkiewicz's | Janusz Minkiewicz | Janusz Magnuski | Janusz Liberkowski | Janusz III of Masovia | Janusz Gortat |