The Biga and its Animals on Ancient Coins
A biga is a two-horse chariot. However, in numismatics the term also applies to chariots pulled by two other animals or fanciful creatures. This site is an illustrated list of the animals and creatures that pull bigae on ancient coins. Most are on Roman Republican denarii. This page does not consider quadrigae (four-animal chariots).
A biga is usually pulled by horses. They are common on Roman Republican coins. Bigae of some other animals are also fairly common on coins of the Roman Republic. Less common are bigae on coins of the Roman empire and on Roman provincial coins. On Greek coins bigae of horses (and perhaps mules) are common from Sicily (e.g. from Syracuse, Himera, Messana, and Catania), but bigae of other animals are rare on other Greek coins.
The Animals are listed here and illustrated below. Horses (driven by Victory [next], Luna, Apollo, a Gallic warrior, Venus, Juno Sospita, a Roman warrior, or Hector)
mules, goats, oxen, elephants, snakes (winged or not winged), lions, panthers, stags, and peacocks.
Other creatures: Centaurs, cupids, hippocamps (aka seahorses), griffins, unmatched pairs.
Horses. Most are on Roman Republican denarii.
Driven by Victory. Victory is, by far, the most common driver of a biga of horses.

Driven by Victory
Roman Republican denarius
101 BC
Cr 323/1. Sear 201
L. JULIUS ("probably not a Julius Caesar" Crawford, page 327.)
Driven by Victory (a second design with the horses rearing, which is an unusal pose):

Driven by Victory
Roman Republican denarius
128 BC.
Cr 260/1. Sear 136
T. CLOULIUS
Driven by Luna
Driven by Luna
Roman Republican denarius
179-169 BC
Crawford 158/1. Sear 69
anonymous
The crescent identifying Luna is barely visible on this example

Driven by Luna
Roman imperial denarius
Julia Domna, wife of Septimius Severus (193-211)
and mother of Caracalla (196-217).
RIC 379c. Sear II 7101
LVNA LVCIFERA
Struck 215 under Caracalla

Driven by a Gallic warrior
Driven by a Gallic warrior
Roman Republican denarius
118 BC.
Crawford 282/5. Sear 158
L. PORCIUS LICINUS
(joint with associate Cn. Domitius)
Driven by Venus
Roman Republican denarius
106 BC
Crawford 313/1b. Sear 190
L. MEMMIUS GALERIA
It is not obvious why this is identified as Venus.
Cr 349/1 of 87 BC, Sear 262, is also driven by Venus. So is Cr 360/1b of 82 BC, Sear 284, P. CREPUSI and C. LIMETAN

Driven by helmeted Roman warrior
Biga of horses, driven by a "male charioteer."
Nike flying right crowning the horses.
Tetradrachm of Syracuse, Sicily. 474-450 BC.
24 mm. 16.95 grams.
Reverse: Head of Artemis-Arethusa right, four dophins around
ΣVRAKOΣION
Sear Greek 924.
Animals (other than horses) and fanciful creatures.
Centaurs
Centaurs
Roman Republican denarius
139 BC.
Cr 229/1a. Sear 106.
M. Aurelius Cotta
COTA up to right
Reverse: Hercules with club driving biga of centaurs holding branches right
M • AVRELI (AVR ligate)
ROMA in exergue
Goats
Goats
Roman Republican denarius
138 BC
Cr 231/1. Sear 108
C. RENI
Oxen
Snakes (serpents) on a Roman provincial coin from Cyzicus:Lions
Lions
Roman Republican denarius
78 BC
Cr 385/4. Sear 315
M. VOLTEIUS
PanthersStags

Stags
Roman Republican denarius
92 BC.
Cr 336/1. Sear 221
C. ALLIUS BALA
Biga driven by Diana, dolphin below.
