copulation

n.

性交，交配，交尾；

复数：copulations

1. The researchers say the females may have died of stress caused by aggressive male copulation attempts.
   对此，研究人员表示，雌性蜥蜴可能是由于雄性蜥蜴富有侵略性的交配行为对其产生了巨大的压力而死亡的。
2. The reproductive system has a complex innervation concerned in copulation and oviposition.
   生殖系统有一个同交尾和产卵有关的复杂神经系统。

Copulation Behaviour of Birds
Copulation corrupts immunity: A mechanism for a cost of mating in insects
Male sperm reserves and copulation frequency in birds
PAIR FORMATION AND COPULATION BEHAVIOR IN LEAST FLYCATCHER CLUSTERS
Forced copulation results in few extrapair fertilizations in Ross's and lesser snow geese.
Variation in copulation duration in Mnais pruinosa pruinosa Selys (Odonata: Calopterygidae)
Courtship and Copulation of a Pair of Grizzly Bears, with Comments on Reproductive Plasticity and Strategy
A Pairwise Comparative Method as Illustrated by Copulation Frequency in Birds
Role of striated penile muscles in penile reflexes, copulation, and induction of pregnancy in the rat
Convenience polyandry in a water strider: foraging conflicts and female control of copulation frequency and guarding duration