Antelope: calf

Bear: cub

Birds: fledgling, nestling

Cat: kitten

Chicken: chick

Cow: calf

Deer: fawn, yearling

http://tbn0.google.com/images?q=tbn:FOFnFsq_ZcbfjM:http://www.fellowmortals.org/gallery/Fawn.JPG
Dog: pup, puppy

Duck: duckling

Eagle: eaglet

http://tbn0.google.com/images?q=tbn:puW4Z9MQ8D8-rM:http://www.eagles.org/eaglet_photo2_2003.jpg
Eel: elver

http://tbn0.google.com/images?q=tbn:dPV3WFmNURsIOM:http://fishing.agrino.org/photos/freshfish/eel.jpg
Elephant: calf

http://tbn0.google.com/images?q=tbn:C1gf7c62fJellM:http://www.lewa.org/lewa-wildlife-conservancy-pics/elephant_baby_on_road.jpg
Elephant seal: weaner

http://tbn0.google.com/images?q=tbn:yMyU5heQmiLSmM:http://www.antarctichorizons.com.au/imagebrowse/130.jpg
Fish: fry

http://tbn0.google.com/images?q=tbn:IF3BhB_MFgHrFM:http://www.aquarticles.com/images/Gallade_Max/fry%2520dev%252013.jpg
Fowl: chick, chicken

http://tbn0.google.com/images?q=tbn:pZuf8WKOtr7tWM:http://hoglezoo.org/animal.photos/jungle.fowl2.jpg
Fox: cub, pup

http://tbn0.google.com/images?q=tbn:KoA2T6gnY5zUdM:http://www.bobatkins.com/photography/Gallery/Great_Swamp_NWR/slides/fox_cub_IMG_1843a.jpg
Frog: polliwog, tadpole

http://tbn0.google.com/images?q=tbn:D8gcqMUytmNjMM:http://www.stowecraft.com/Merchant2/graphics/20108Za9polliwog_tn.jpg
Goat: kid

http://tbn0.google.com/images?q=tbn:Hg4UYLq9DQe-1M:http://www.property-in-the-sun.com/images/Blog/may_2006/pepas_chivo.jpg
Goose: gosling
Hawk: eyas
Hen: pullet
Hippo: calf
Horse: foal, yearling, or colt (male), filly (female)
Kangaroo: joey
Lion: cub
Owl: owlet
Pig: piglet, shoat, farrow, suckling
Pigeon: squab, squeaker
Quail: cheeper
Rabbit: bunny, kit
Rat: kitten
Rhino: calf
Rooster: cockerel
Salmon: parr, smolt, grilse
Seal: pup
Shark: cub
Sheep: lamb, lambkins
Swan: cygnet
Tiger: cub, whelp
Turkey: poult
Whale: calf
Zebra: foal