Nick Upton / Ivy bee (Colletes hederae) mating ball, showing a mass of males clustered around a female recently emerged from her burrow, Wiltshire, England, UK, September.
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John Cancalosi / American toads (Anaxyrus americanus), several males competing to mate with female, Maryland, USA, April.
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John Cancalosi / American toads (Anaxyrus americanus), several males competing to mate with female, Maryland, USA, April.
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John Waters / Underwater view of a group of Common toads (Bufo bufo) in a mating ball in a pond, Priddy, Somerset, England, UK, March.
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John Waters / Group of Common toads (Bufo bufo) in a mating ball in a pond, Priddy, Somerset, England, UK, March.
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John Waters / Group of Common toads (Bufo bufo) in a mating ball in a pond, Priddy, Somerset, England, UK, March.
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Francois Savigny / Breeding ball of Anacondas {Eunectes murinus} Venezuela - up to 10 males surround one female
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Nick Upton / Ivy bee (Colletes hederae) mating ball, showing a mass of males clustered around a female recently emerged from her burrow, Wiltshire, England, UK, September.
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Nick Upton / Ivy bee (Colletes hederae) mating ball, showing a mass of males clustered around a female recently emerged from her burrow, Wiltshire, England, UK, September.
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Nick Upton / Pair of mating Ivy bees (Colletes hederae) struggling to climb grass stems as many other males compete to mate, Wiltshire, England, UK, September.
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Nick Upton / Ivy bee (Colletes hederae) mating ball, showing a mass of males clustered around a female recently emerged from her burrow, Wiltshire, England, UK, September.
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John Cancalosi / American toads (Anaxyrus americanus), several males trying to mate with female, Maryland, USA, April.
