- electric eel
- eel-sucker
- egret
- eider-duck
- elasmobranch
- edentate
- eider
- elephant
- elver
- elytrophore
- elk
- elytron
- ember
- embryogenesis
- embryology
- emeu
- emu
- entomologist
- entomology
- entoparasite
- entozoon
- endopodite
- endostyle
- entomic
- entomostracan
- ephemera
- ephemeris
- epimeron
- epipodite
- epistoma
- epizoa
- epizoic
- epizoon
- equidae
- elytra
- ember-goose
- endocyst
- endoskeleton
- entellus
- entomological
- entomotomy
- entozoa
- eperlan
- ephemerae
- ephemerides
- epicuticle
- erinaceous
- erne
- escargot
- eucephalous
- euglena
- eustomatous
- ermine
- escallop
- eutheria
- ewe
- exopodite
- exoskeleton
- excurrent
- fasciated
- falcon
- falconet
- fallow-deer
- eyas
- eye-spotted
- falx
- fancy
- fawn
- feed
- fiddler
- fieldfare
- feeler
- felid
- female
- fennec
- fern-owl
- ferret
- fingerling
- fire-beetle
- fire-fish
- fire-flair
- fireback
- fiddler-crab
- fig-eater
- finback
- finch
- finger-fish
- finnan
- fire-fly
- fitchet
- fitchew
- five-finger
- fiver
- flamingo
- flamingoes
- flat-head
- flitter-mouse
- flying fish
- flying mouse
- fog