1.  Otus, the long-eared owl.

2.  It is unclear exactly what Alciato is referring to here. As is made clearer by Mignault in the commentary in other editions, it is not the Emperor Otho, but the bustard (otis in Latin, otide in French), a large tufted bird that has interesting mating habits, which (following the commentary in the 1615 edition) consists of strutting and preening to such an extent that the bird is easy to catch. It is there likened to a man named Otho known for his haughty manner, who came from an ancient lineage, in which instance Alciato could originally have been referring in a punning manner to Lucius Roscius Otho, a Roman tribune who authored the law that the knights should occupy the premier seats in a theatre and was much abused for it.

3.  See Pliny, Natural History, 11.50.137: only the eagle-owl and the long-eared owl have feathers like ears (the little owl - noctua - does not in fact have ear-tufts).

4.  See Pliny, Natural History, 10.33.68: ‘The otus is an imitator of other birds and a hanger-on, performing a kind of dance; like the little owl, it is easily caught, when its attention is fixed on one person while another person circles round it’. See also Plutarch, Moralia, Bruta animalia ratione uti, 951E.