"It would have been impossible for me to kill this affectionate mother, who had exhibited such an example of presence of mind, reason, and sound judgment." — Wilson
"Undoubtedly, all birds have a more or less well-defined means of communication, though differing." — Unknown
"The clever little builders are, as a rule, far from being distressful, and often exhibit intelligence that is undeniable." — Unknown
"Being very sleepy little fellows, they rarely move, and though standing within a few inches of them, the observer might suppose them to be two old brown leaves." — Unknown
"So strong is this habit of striking with its sword that when a dead fish is tossed overboard, the swordfish will strike at it." — Unknown

Quotes on animal intelligence versus mere instinct in parental care

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