dual evolution from the filmy
outer covering of the lowest living forms to the beautiful feathers,
beaks, and claws of the bird!

The evolving of wings meant much to the ascending forms of life. The
Reptiles were compelled to live in a narrow circle of territory, while
the Birds were able to travel over the earth in wide flights. And
travel always develops the faculties of observation, memory, etc., and
cultivates the senses of seeing, hearing, etc. And the creature is
compelled to exercise its evolving "thinking" faculties to a greater
extent. And so the Birds were compelled by necessity of their travels
to develop a greater degree of thinking organism. The result is that
among birds we find many instances of intelligent thought, which cannot
be dismissed as "mere instinct." Naturalists place the Crow at the head
of the family of Birds, in point of intelligence, and those who have
watched these creatures and studied the mental processes, will agree
that this is a just decision. It has been proven that Crows are capable
of counting up to several figures, and in other ways they display a
wonderful degree of almost human sagacity.

Next above the Bird family comes the highest form of all--the Mammals.
But before we begin our consideration of these high forms, let us take
a hasty glance at the "connecting-links" between the Birds and the
Mammals. The lowest forms of the Mammals resemble Birds in many ways.
Some of them are toothless, and many of them have the same primitive
intestinal arrangements possessed by the birds, from which arises their
name, _Monotremes_. These _Monotremes_ may be called half-bird and
half-mammal. One of the most characteristic of their family is the
_Ornithorhynchus_, or Duck-bill, which the early naturalists first
thought was a fraud of the taxidermists, or bird-stuffers, and then,
when finally convinced, deemed it a "freak-of-nature." But it is not a
freak creature, but a "connecting-link" between the two great families
of creatures. This animal presents a startling appearance to the
observer who witnesses it for the first time. It resembles a beaver,
having a soft furry coat, but also has a horny, flat bill like a duck,
its feet being webbed, but also furnished with claws projecting over
the edge of the web-foot. It lays eggs in an underground nest--two eggs
at a time, which are like the eggs of birds, inasmuch as they contain
not only the protoplasm from which the embryo is formed, but also