... in Birds BBT18 Birds That Vocally Mimic Only in Captivity BBT19 Vocal Mimicry of Hosts by Parasitic Species BBT20 Duetting BBT21 Chorusing BBT22 Large Vocal-Repertoire Sizes and High Speeds of Delivery BBT23 Female Singers BBT24 Whisper Songs and Subsongs BBT25 The Two-Voice Phenomenon BBT26 Some Curiosities of Avian Vocalizations BBT27 Incubator Nests BBT28 Woven and Sewn Nests BBT29 Nests Containing Protective Materials BBT30 Bowers BBT31 Nest Curiosities BBT32 Tool Use BBT33 Communication between Chick Embryos BBX AVIAN INTERFACE PHENOMENA BBX1 Unusual Attacks on Humans BBX2 Unusual Predators of Birds BBX3 Unusual Bird-Animal Psychological Interfaces BBX4 Curious Associations of Birds with Other Animals and Plants BC BIOCHEMISTRY Titles not yet posted BF FISH Titles not yet posted BG GENETICS Titles not yet posted BH HUMANS BHA EXTERNAL APPEARANCE AND MORPHOLOGY BHA1 Human Asymmetry BHA2 The Appearance of Beauty in the Human Lineage BHA3 General Physique ... "Footedness") in Birds BBB16 Unusual Aerial Transportation Techniques BBB17 Unusual Forms of Terrestrial Locomotion BBB18 Unusual Hunting Strategies BBB19 Cooperative Hunting BBB20 Prey-Handling Puzzles BBB21 Avian Prey and Food: Some Misconceptions BBB22 Unusual Sexual Behavior BBB23 Avian "Sperm Wars': Cloaca Pecking BBB24 Unusual Mating Systems BBB25 Two Species with a Common Nest BBB26 Determination of Clutch Size BBB27 Exotic Objects and Eggs in Nests BBB28 Unusual Methods of Heating and Cooling Eggs BBB29 Brood Parasitism: How Did It Begin BBB30 Disparities between Parasite Host Adaptations BBB31 Tolerance of Parasite Chicks BBB32 Tolerance of Parasite Eggs Even When They Are Recognized as a Threat BBB33 Murder for Purposes Other Than Food and Brood Reduction BBB34 Infanticide BBB35 Siblicide BBB36 Information Processing in Migratory Behavior BBB37 Uncommon Groupings of Birds BBB38 Flock Synchrony BBB39 Flight Formations BBB40 Avian "Courts" and ...