Pp. 50-71), was found to be established on a single character of the feet only; though he was careful to point out, immediately after formulating the definition of his subclasses Constrictipedes and Inconstrictipedes, that the former " make, in general, compact and well-built nests, wherein they bring up their very weak, blind, and mostly naked young, which they feed with care, by bringing food to them for many days, until they are fledged and sufficiently strong to leave their nest," observing also that they " are principally monogamous " (pp. 55, 56); while of the latter he says that they " make either a poor and rude nest, in which they lay their eggs, or else none, depositing them on the bare ground.
The lion appears to be monogamous, a single male and female continuing attached to each other irrespectively of the pairing season.
They are mainly monogamous, and by rigidly abstaining from foreign marriages have preserved racial purity.
They are monogamous, and their conjugal fidelity contrasts strongly with the vicious habits of the Sinhalese.