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31. These food-induced social patterns themselves induce slightly different mating patterns.

32. During mating season, female butterflies respond to subtle signals from the males.

33. Language differences, a huge barrier to mating, exemplify genetic isolating mechanisms.

34. There, every morning soon after dawn, two pigeons performed an elaborate and very noisy mating dance.

35. Experimental studies on birds and fish have shown that male ornaments can be favoured by female mating preferences.

36. Dennis's unwitting participation in our mating was so exciting that we soon overcame any lingering doubts about the risks involved.

37. Females, by contrast, gain no advantage by mating with many males.

38. The two species share the same food, habitat, and enemies, yet have entirely different mating systems.

39. Artificial selection, for instance, has demonstrated a genetic influence on the mating preferences of ladybirds.

40. After mating,[www.Sentencedict.com] the territory is advantageous in protecting the eggs and young fish.

41. Three or four days before mating, the male develops a pouch on his belly.

42. The child of a black white mating, safe from both cystic fibrosis and sickle-cell disease, is hybrid vigour personified.

43. In the 1970s zoologists began to investigate these patterns to try to find out what determined a species' mating system.

44. They were now deeply into their mating dance, oblivious to all that went on beyond the charmed circle of their courtship.

45. Females are attracted by males' displays and go to them for mating.

46. In this case, the mating of these unique bodies and the Bartolini systems makes for a distinctive family sound.

47. The inconspicuous dunnock has the most variable mating system of any known bird.

48. In large leks the satellites have little chance of mating as they are driven away by the residents.

49. Marshes also provide life-saving cover for female crabs that have shed their shells in preparation for mating.

50. How to account for the improbable mating of a dream and - yes, Bob was probably right - an obsession.

51. The evolution of mating and rearing systems with attendant complexities of nepotistic behaviour occurs within and is part of this process.

52. Many insects have particular types of place where they congregate for mating.

53. A glance at the mating behaviour of cats tells why.

54. Soon they begin to multiply, but not by mating and laying eggs.

55. During mating the female holds her pelvic fins together to form a pouch into which the eggs are laid.

56. Sho? t wondered why that was and suggested that it might have something to do with the mating system.

57. Furthermore, the best available mating may be with a sibling or an offspring on certain occasions.

58. There are usually more females than males present on an infested person and the males are relatively promiscuous, mating frequently.

59. Males have display or song posts to which they attract females for mating.

60. A sage grouse in full mating display will compete for the attentions of females on the lek.